ECHINODERMATA - KU ScholarWorks - University of Kansas

32 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
Type.—Paratype, E13,014, one specimen, collected
by F. WATTLES (1941), studied by REIMANN (1944), Buffalo
Society of Natural Sciences, Buffalo, New York.
HYPEROBLASTUS FILOSUS (Whiteaves)
Plate 7, figure 9; Plate 8, figures 1-6, 10-11; text-figs. 29-33
Pentremifidea filosa WHITEAVES, 1887 (1889), P. 104, pl. 14, figs.
la, lb.
Description.—This species is described mainly on the
basis of features of the holotype. Calyx calcitic, clubshaped
in side view, pentagonal in top view, 13 mm.
long by 9 mm. wide, vault 9 mm. long, pelvis 4 mm.
long, pelvic angle on basals 70 degrees and on radial
bodies 140 degrees. Periphery about at mid-height. Stem
round, approximately 0.75 mm. in diameter with about
30 crenellae extending half the radial distance from the
circumference toward the central lumen. Basal circlet
pentagonal, 4.5 mm. in diameter, with three normally
disposed basais. Radials five, each 11 mm. long by 5 mm.
wide, with sinus 10 mm. long by 1-1.5 mm. wide, slightly
tapering, with steep subparallel sides; radials overlapping
deltoids.
The four deltoids are confined to the summit, each
about 1 mm. long, almost completely covered by the
radials and forming part of the margins of the ambulacra.
Each deltoid is notched by a spiracle in the adoral end,
with a deep well-developed deltoid septum that connects
the deltoid body with the deltoid lip. On the anal side
there are four deltoid plates, a superdeltoid next to the
oral opening on the adorai side of the anispiracle, two
deeply hidden cryptodeltoids on either side of the anispiracle
internally, and a pentagonal hypodeltoid, 1.5 mm.
long by 1.5 mm. wide, seen in side view, abutting against
the radial limbs and overlapping the cryptodeltoids. The
cryptodeltoids are infolded to form hydrospires, the superdeltoid
is infolded to help form the anispiracle, and the
hypodeltoid is similar to an expanded deltoid body. Five
hydrospire folds are present on each side of an ambulacrum,
with the aboral ends slightly exposed along the
radial sinus, above the pores, in well-preserved specimens.
Ambulacra five, each 11 mm. long by 1.5 mm. wide,
linear, with lancet covered by side plates, and 30 side
plates in 10 mm. The side plates are normally disposed,
with approximately four cover-plate sockets to each side
plate along the main food groove, and one large triangular
gap or pore between the side plates and margins of the
radial sinuses. The surfaces of calyx plates are ornamented
with fine growth lines parallel to plate margins.
Remarks.—This species and others of the genus Hyperoblastus
may readily be distinguished by shape as
seen in side view and expressed by various ratios, such as
length to width and length of vault to that of pelvis, in
conjunction with the pelvic angle.
Occurrence.—Middle Devonian, coral zone of Widder
beds, Hungry Hollow Formation, Thedford, and Arkona,
Ontario.
Types.—Holotype, 3,660, marked by a red dot and
red x; syntypes, 3,660a-f, six specimens together with
holotype, Rev. H. CURRIE collection (1877-82), old number
13, identified by WHITEAVES (1889), Thedford area,
Geological Survey of Canada, Ottawa, Ontario. Hypotypes,
E13,960, six specimens, one polished, collected by
CHARLES SOUTH WORTH, purchased (1942), near Thedford;
E16,206, 14 specimens, one thin section, Charles Southworth
collection, near Thedford; E16,209, one specimen,
Charles Southworth collection, by purchase, studied by
REIMANN (1944), near Arkona, Buffalo Society of Natural
Sciences, Buffalo, New York.
HYPEROBLASTUS FILOSUS ANGUSTUS
(Reimann)
Plate 8, figures 7-9; Plate 9, figure 8; text-fig. 35
Pentremitidea filosa var. angusta REIMANN, 1945, pp. 31-32, pl. 6,
figs. 20-33.
Description.—The holotype is 12.5 mm. long by 7.5
mm. wide, vault 9 mm. long, pelvis 3.5 mm. long, and
pelvic angle on basal circlet 65 degrees and on radial
bodies 115 degres. It is a thin variety of H. filosus.
Occurrence.—Middle Devonian, coral zone of Widder
beds, Hungry Hollow Formation, near Thedford, Ontario,
Canada.
Types.—Holotypes, E15,403, one specimen, Charles
Southworth collection, purchased (1942), identified by
REIMANN (1944); paratypes, E13,055, eight specimens,
Charles Southworth collection, purchased (1941), identified
by REIMANN (1944), Buffalo Society of Natural Sciences,
Buffalo, New York.
EXPLANATION OF PLATE 3
FIGURE
1 -9. Cryptoschisma schultzii (D'ARCHIAC & DE VERNEUIL),
Lower Devonian, Spain. I. Topotype, E1,063b, Brit.
Mus. (Nat. Hist.); Calizas de Arnao, Colle near Sabero;
long, thin sec, of ambulacrum showing the hydrospire
folds ( X13).-2, 7-9. Topotypes, 311, Harvard Mus.
Comp. Zoology; Calizas de Arnao, Sabero; 2, side view
of stem connected to basal plates, (X6.4); 7, oral view
with side plates removed on anal side showing where
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hypodeltoid (missing) would fit (X5.7); 8-9, "D" ambul
acral , aboral views, ( X 5.7 ).-3-6. Topotypes,
S3,224, Springer coll., U.S. Natl. Mus.; Calizas de Ferroties,
Asturias; 3, "A" ambulacral view showing three
subbasals at top of stem and below basais (X4.3); 4,6.
"D" ambulacral, aboral view of another specimen ( X7.6);
5, oral view of another specimen showing side plates in
place covering hypodeltoid ( X7.8) 25