Geology and Paleontology of Canal Zone and Adjoining ... - USGS

434 GEOLOGY AND PALEONTOLOGY OF CANAL ZONE
Though the siphonal canal of the only specimen,
found in the lower part of the Gatun formation, is
missing, the sculpture is unmistakable. The occurrence
of this species in the Chipola formation, recorded by
Vokes, extends its time range; that in Panama ex­
pands the middle Miocene distribution; and late Mio­
cene specimens from Florida, also recorded by Vokes,
fill in a time gap. Eight shells of that age are in Druid
Wilson's Acline collection of that age. On the Florida
late Miocene and Pilocene shells the bands of down­
ward loops on the apertural face of the varices are
wider and therefore more conspicuous than the bands
of upward loops. The sutural whorl-concavity is deeper
on Pliocene specimens than on those of middle and
late Miocene age. A progressive increase in size is
shown by the available material: early Miocene, 15
mm; middle Miocene, 33 to an estimated 40 mm; late
Miocene, estimated 48 mm; Pliocene, 56 to 67 mm.
This remarkable species left no descendants. It may
be related to the Miocene Italian Pterynotus latilabris
(Bellardi and Michelotti) (Bellardi, 1873, p. 88, pi. 4,
%. 11).
Occurrence: Lower part of Gatun formation (middle
Miocene), locality 138c. Chipola formation (early Mio­
cene) , Florida. Cantaure formation (middle Miocene),
Venezuela. Miocene (presumably Cercado or Gurabo
formation), Dominican Republic. Deposits of late Mio­
cene age, Florida. Caloosahatch.ee formation (Plio­
cene) , Florida.
Subfamily TYPHINAE
Genus Typhis Montfort
Subgenus Talityphis Jousseaume (p. 221)
Typhis (Talityphis) eucteanus Woodring, n. sp.
Plate 63, figures 9, 10
Small, slender, spire high. Early whorls worn. Re­
maining whorls bearing four varices, ending on shoul­
der in blunt, hollow spines. Terminal varix lamellar,
others fairly wide. Tubes closer to preceding varix than
to succeeding varix, generally broken almost to base.
Spiral sculpture faint or absent on spire whorls. Body
whorl bearing six weak, widely spaced spiral threads,
most conspicuous on flanks of terminal varix. Terminal
varix expanded, its edge frilled by the spiral threads.
Siphonal canal short, tip missing.
Height (practically complete) 19 mm, diameter 9.7
mm (type). Height (practically complete) 23.3 mm,
diameter (incomplete) 11 mm (largest specimen).
TyperUSNM 646083.
Type locality: 138f (USGS 23663, south side of
Transmisthmian Highway, hillside excavation at Col-
choneria Yero, about 450 meters southwest of Cativa,
Panama, lower part of Gatun formation.
This small, slender species was found in the lower
part of the Gatun formation. Three were collected at
the type locality and three others, available through
the kindness of H. E. and E. H. Vokes, are in the
Tulane collection from a nearby locality.
Typhis eucteanus is smaller and more slender than
T. alatus Sowerby (1850, p. 48, pi. 10, fig. 4; height
31.8 mm, diameter 9 mm), collected only by Heneken
in the Dominican Republic, and the varices, other than
the terminal varix, of the Gatun species, are less lamel­
lar. It is of the same size as T. pterinus Gardner (1926-
47, p. 528, pi. 53, fig. 14, 1947; Shoal River formation,
Fla.), but is more slender and the varices of that spe­
cies are like those of T. alatus. On the contrary the
varices of T. puertoricensis Warmke (1964), a small
species living in Puerto Rican waters, are high and
wide.
Occurrence: Lower part of Gatun formation (middle
Miocene), locality 1381
Family NASSARIIDAE
Genus Psilarius Woodring
Woodring, Nautilus, v. 77, no. 4, p. 143, Apr. 14, 1964. Substitute
name for Leptarius Woodring, p. 272 of present account,
Feb. 27, 1964, not Leptarius Gill, 1863.
Attention is drawn to the substitute name for the
junior homonym Leptarius.
Family OLIVIDAE
Subfamily OLIVIFAE
Genus Oliva Bruguiere
Subgenus Strephonella Ball (p. 278)
Oliva (Strephonella) colpotus Woodring, n. name
Oliva plicata Guppy, in Guppy and Dall, U.S. Natl. Mus. Proc.,
v. 19, p. 308, pi. 30, fig. 12, 1896 (Miocene, Jamaica). Not
Oliva plicata Fischer von Waldheim, Museum-Demidoff,
v. 3, p. 161, Moscow, 1807.
Oliva dimidiata Pilsbry and Johnson, Acad. Nat. Sci. Phila.
Proc., v. 69, p. 165, 1917 (Miocene, Dominican Republic).
Not Oliva dimidiata Sowerby, in Darwin, The geology of
the voyage of the Beagle, pt. 3, Geological observations
on South America, p. 263, London, 1846.
Both Oliva plicata Guppy, the name used on page
278 of the present account, and its subjective synonym
Oliva dimidiata Pilsbry and Johnson are junior homo­
nyms.
Family?
Genus Glyptostyla Dall
Glyptostyla panamensis Dall (p. 289)
Plate 48, figure 23
After publication of chapter C, A. A. Olsson ex­
posed by careful work the columella of two specimens
of Glyptostyla panamensis. They show that the folds