ECHINODERMATA - KU ScholarWorks - University of Kansas

56 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
broken. Basal circlet conical in side view, rounded pentagonal
in basal view, 9 mm. long by 7 mm. wide. Radials
five, wide, subquadrangular, each 10 mm. long by 6 mm.
wide, with short, narrow, shallow sinus 6 mm. long by
1.5 mm. wide, with outward-flaring radial lips, giving a
pentalobate appearance to the calyx in top view. The
radial limbs are shorter on the anal side than on the other
sides. Radials overlap deltoids.
Deltoids four, not visible in side view, each divided
into a small quadrangular deltoid body 0.5 mm. long by
0.5 mm. wide and a lip that is approximately 0.5 mm.
wide, with a large, wide oval spiracle between, each
spiracle bordered laterally by a lancet stipe and side
plates. On the anal side there are four deltoid plates,
two of which (superdeltoid and hypodeltoid) are seen
externally, the two cryptodeltoids being hidden beneath
the hypodeltoid. The superdeltoid is adjacent to the oral
opening and bordered aborally on each side by a lancet
stipe. The wide oval anispiracle is located between the
superdeltoid and pentagonal hypodeltoid, the latter plate
being 1.5 mm. long by 1.5 mm. wide and barely visible in
side view. Internally, the two cryptodeltoids rest on the
aboral face of the superdeltoid, separating the anal spiracles
from the anal opening internally and they are overlapped
by the radial limbs and hypodeltoid. Thus, there
are five openings around the oral opening, the four
spiracles and anispiracle.
Ambulacra five, linear, each 8 mm. long by 1.5 mm.
wide, with lancet covered by side plates except along the
main food groove at the adorai end. There are 22 side
plates in a space of 10 mm. along an ambulacrum, one
pore between adjacent side plates along radial margins,
and pores absent along deltoid margins. In mature specimens
there are nine hydrospire folds on each side of an
ambulacrum, including the anal side. The surfaces of
the calyx plates are ornamented with fine growth striae
parallel to plate margins. One abnormal specimen has a
sixth short radial developed on the summit between the
(D) and (E) radials.
There is much variation in this species and more work
needs to be done on the small specimens. In one small
specimen there appeared to be only four hydrospire folds
on each side of an ambulacrum.
Occurrence.—Middle Devonian, Eifelian, Pram,
Gerolstein, Nollenbach, Germany.
Types.—Topotypes, 213, one specimen, Schultze collection,
old no. 25, Eifel; 305, six specimens, old no. 2348,
Nollenbach bei Kerpen, Schultze collection. Plesiotype,
195, one specimen, old no. 26, Eifel, Schultze collection,
Harvard Museum of Comparative Zoology, Cambridge,
Mass. Plesiotypes, E21,087, two specimens, Eifel and
E21,109, two specimens, Gerolstein, Prussia, Buffalo Society
of Natural Sciences, Buffalo, New York. Others not
studied in detail or figured are in the Walker Museum,
87
FIGURE 87. Cordyloblastus eifelensis (RoEmEa), Eifelian,
Nollenbach, Germany (Buffalo Soc. Nat. Sci., no. E21,-
109); partial cross section of "E" ambulacrum, X45.
[Explanation.—R, radial; Rp, radial lip.]
University of Chicago, and in the United States National
Museum.
CORDYLOBLASTUS GILBERTSON'
(Etheridge & Carpenter)
Plate 23, figures 1-3
Pentremitidea gilbertsoni ETHERIDGE & CARPENTER, 1886, pp. 24,
179, pl. 5, figs. 9-11.
Pentremites clavatus SCHULTZE, 1866, 1867, p. 225, pl. 13, fig. 7c
only.
Description.—Calyx calcitic, 8.5 mm. long by 7.5 mm.
wide, vault 6 mm. long, pelvis 1.5 mm. long, pelvic angle
on basals 50 degrees, and on radial bodies 170 degrees,
with ambulacra slightly recurved below, and periphery
above radial lips.
Remarks.—The figured specimen appears to be the
same one as figured by SCHULTZE on pl. 13, fig. 7c and is
here removed from Cord yloblastus clavatus.
Occurrence.—Middle Devonian, Eifel beds, Pelm, Germany.
Types.—Plesiotypes, 313, three specimens, Schultze
collection, the figured specimen probably being one of
SCHULTZE ' S syntypes of Pentremites clavatus, old no. 2347,
Harvard Museum of Comparative Zoology, Cambridge,
Mass.