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NUMBER 557 51<br />
MATERIAL EXAMINED.—New Records: USGS 17450, near<br />
Iwa, Okinawa, Shimijiri marl (Pleistocene), 1, USNM 88652;<br />
TM (KT9015, BS2), 8, USNM 92686, 3, ORI; TM (KT9202,<br />
OS2), 1, USNM 92687; TM (KT9202, OS3), 4, USNM 92688;<br />
TM (KT9309, AM8), 1, ORI; off Misaki, Japan, Mortensen<br />
Expedition, 30 June 1914, 366 m, ZMC. Previous Records:<br />
Specimen illustrated by Wells (1956), USNM.<br />
TYPES.—Syntypes of P. compressus are deposited at the<br />
TIUS (see Yabe and Eguchi, 1942b). Type Locality: Pleistocene,<br />
Ryukyu limestone of Kikai-jima.<br />
DISTRIBUTION.—Pleistocene of Ryukyu Islands. Recent:<br />
Kii and Bungo Straits; van Dienem Strait, southern<br />
Kyushu; Wakasa Bay, Honshu, Sea of Japan; off Amami<br />
Oshima, Ryukyu Islands; 115-422 m.<br />
Crispatotrochus Tenison Woods, 1878<br />
DIAGNOSIS.—See Part 1.<br />
Crispatotrochus rube see ns (Moseley, 1881)<br />
PLATE 22gji<br />
Cyathoceras rubescens Moseley, 1881:157, pi. 2: fig. 8a-c.—Marenzeller,<br />
1888b:21-22.—Yabe and Eguchi, 1942b: 117.—Cairns. 1984:15.<br />
Cyathoceras diomedeae Vaughan, 1907:77-78, pi. 7: figs. 1, 2.<br />
Cyathoceras diomedae [sic].—Yabe and Eguchi, 1942b: 116-117, pi. 9: fig. 8.<br />
Crispatotrochus rubescens.—Cairns, 199la: 15.<br />
DESCRIPTION.—Corallum ceratoid, with a flared calice and a<br />
firmly attached pedicel about one-quarter diameter of calice.<br />
Illustrated specimen (Soyo Afaru-331) 24.3 x 20.6 mm in<br />
calicular diameter and 30.4 mm in height, with a pedicel<br />
diameter of 6.6 mm. Costae ridged only near calice, otherwise<br />
consisting of broad, flat, finely granulated strips. Corallum<br />
white or reddish brown.<br />
Septa hexamerally arranged in 5 cycles: S1.2>S3>S4>S5.<br />
S1-2 highly exsert (as much as 7 mm), and have sinuous,<br />
vertical inner edges that join the columella. S3 considerably<br />
less exsert (about 4 mm), but as much as 80% as wide as S^<br />
and also have sinuous inner edges. S4.5 equally exsert (about<br />
2.5 mm), the S4 about half size of S3 and the S5 about half size<br />
of S4. Fossa moderately deep, containing a crispate, fascicular<br />
columella composed of 15-20 slender, twisted elements.<br />
DISCUSSION.—Of the 12 valid species of Crispatotrochus<br />
(see Cairns, 1991a), only three have five cycles of hexamerally<br />
arranged septa: C. rubescens (Moseley, 1881); C. niinoi (Yabe<br />
and Eguchi, 1942b); and C.foxi (Durham and Barnard, 1952),<br />
all of which occur in the temperate North Pacific and included<br />
in this account. C. rubescens is compared to the other two<br />
species in the discussions of those species.<br />
Both new records reported herein are small specimens with<br />
a GCD less than 8 mm and have only four cycles of septa.<br />
MATERIAL EXAMINED.—New Records: TM (CR79-1), 1,<br />
USNM 92685; Okinose, Sagami Bay, 110 m, 11 June 1914, 1,<br />
ZMC. Previous Records: Soyo Maru-425,2, TIUS 53695 (C<br />
rubescens of Yabe and Eguchi, 1942b); Soyo Afaru-331, 1,<br />
TIUS 53694 (C. diomedae of Yabe and Eguchi, 1942b), Plate<br />
22/i.<br />
TYPES.—The holotype of Cyathoceras rubescens is lost (see<br />
Caims, 1984). Type Locality: Challenger-192: 5°49 / 15"S,<br />
132°14'15"E(Kei I., Banda Sea, Indonesia), 236 m.<br />
The types of Cyathoceras diomedeae are deposited at the<br />
USNM (see Cairns, 1991b). Type Locality: Alb-3835:<br />
21°00'10"N, 157°5(rw (south of Molokai, Hawaiian Islands),<br />
309-333 m.<br />
DISTRIBUTION.—Japan: Sagami Bay and off Kushimoto,<br />
Honshu; off southeastern Shikoku; off Koshiki I., southwestern<br />
Kyushu; 110-344 m. Elsewhere: Hawaiian Islands, Christmas<br />
I., Philippines, Banda Sea; 183-634 m.<br />
Crispatotrochus niinoi (Yabe and Eguchi, 1942)<br />
Cyathoceras niinoi Yabe and Eguchi, 1942b:117, 145-146, pi. 9: fig.<br />
9a,b.—?Song, 1982:134-135, pi. 2: figs. 1, 2; 1991:133.<br />
Crispatotrochus niinoi.—Cairns, 1991 a: 15.<br />
REDIAGNOSIS OF HOLOTYPE.—Corallum ceratoid: 15 x 10.5<br />
mm in calicular diameter and 20 mm in height, with a pedicel<br />
diameter of 2 mm (PD:GCD = 0.13). Theca thick and smooth;<br />
noncostate. Upper theca white, lower three-quarters of theca<br />
eroded and encrusted. Septa hexamerally arranged in 5<br />
complete cycles (96 septa) according to the formula:<br />
S1.2>S3>S4>S5. S,_2 slightly exsert (about 1.1 mm) and<br />
extend to the columella. S3 about three-quarters width of an<br />
S^; S4 about three-quarters width of an S3; S5 rudimentary.<br />
Columella fascicular, composed of 7 fused twisted elements.<br />
DISCUSSION.—Crispatotrochus niinoi is known from only<br />
one, perhaps two (if Song's specimen is included), specimens,<br />
neither of which is available for study. The dignosis above<br />
comes from Yabe and Eguchi's (1942b) original description.<br />
Only two other species of Crispatotrochus are known to<br />
have five cycles of septa: C. rubescens (Moseley, 1881) and C.<br />
foxi (Durham and Barnard, 1952). Crispatotrochus niinoi<br />
differs from C. rubescens in having a smaller corallum and<br />
pedicel (PD:GCD = 0.13 vs 0.22-0.27 for C. rubescens); a<br />
thicker, noncostate theca; and less exsert septa. Crispatotrochus<br />
niinoi is compared to C.foxi in the account of that species.<br />
Song's (1982) record from off South Korea is queried because<br />
the PD:GCD is 0.80.<br />
MATERIAL EXAMINED.—None.<br />
TYPES.—The holotype of Cyathoceras niinoi is deposited at<br />
the TIUS (59070). Type Locality: Taito-zaki, Chiba-ken (off<br />
Boso Peninsula, Honshu), 104 m.<br />
DISTRIBUTION.—Off Boso Peninsula, Honshu; ? Western<br />
Channel of Korea Strait off Pusan, South Korea, depth<br />
unknown (Song, 1982); 104 m.<br />
Paracyathus Milne Edwards and Haime, 1848a<br />
DIAGNOSIS.—See Part 1.