ECHINODERMATA - KU ScholarWorks - University of Kansas

52 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
syntypes). Rundle Limestone, Stoney Squaw Mountain
(P. perelongatus type), and Cascade Mountain (P. grandis
type), Alberta, Canada.
Types.—Syntypes, 111,762, three specimens, U. S. National
Museum, Washington. Plesiotypes, 8,914 (holotype
of Pentremites grandis WARREN), one specimen; 8,915
(holotype of Pentremites perelongatus WARREN), one
specimen, Geological Survey of Canada, Ottawa.
Genus CARPENTEROBLASTUS Rowley, 1901
Type-species, by original designation.—Granatocrinus (Schizoblassus)
magnibasis ROWLEY, 1895.
Generic diagnosis (emend. FAY, herein).—Spiraculate
blastoids with eight spiracles in addition to an
anispiracle, located between epideltoid and hypodeltoid
plates, lancet exposed along food groove proper,
with ?two hydrospire folds on each side of an ambulacrum,
one pore between adjacent side plates along
deltoid and radial margins, base convex, radials overlapping
deltoids, and calyx form conico-elliptical.
Mississippian, Missouri, ?Kentucky.
Remarks.—The genus Carpenteroblastus may have
been derived from a form similar to Lophoblastus in
which the three hydrospire folds atrophied to produce
two folds on each side of an ambulacrum.
CARPENTEROBLASTUS MAGNIBASIS (Rowley)
Plate 37, figures 11-12; plate 45, figures 10-12; text-figs. 74-76
Granatocrinus (Schizoblastus) magnibasis ROWLEY, 1895, p. 220,
figs. 11-14.
Description.—Calyx calcitic, flattened ellipsoidal, with
convex base in side view, strongly pentagonal in top view,
11 mm. long by 11.5 mm. wide, vault 9 mm. long, pelvis
2 mm. long, pelvic angle 130 degrees, periphery at midheight,
summit flat. The stem is not well preserved, but
is round, crenellar, and about 1 mm. in diameter. Basal
circlet 1.5 mm. long by 6 mm. wide, pentagonal in basal
view, convex outward, with large round ridges on each
side of basiradial sutures, and with three normally disposed
basal plates. Radials five, each hexagonal in side
view, 9 mm. long by 5 mm. wide, with narrow, moderately
deep sinus 7 mm. long by 1.5 mm. wide, with
outward-projecting sides and rounded raised rims, giving
a marked stellate appearance to the calyx in top view;
radials overlapping deltoids.
Deltoids four, large, broadly lancet-shaped, each 3.5
mm. long by 4.5 mm. wide, the adorai tips of each pierced
by two separate spiracles, thus forming eight spiracles
around the oral opening. On the anal side the anispiracle
is located between a pentagonal epideltoid and pentagonal
hypodeltoid; thus, a total of nine spiracles occur around
the oral opening.
Ambulacra five, long, linear, recurved below, each 13
mm. long by 1.5 mm. wide, with lancet exposed along
food groove, the exposure being progressively wider toward
the adorai end. There are 30 side plates in a space
of 10 mm. along an ambulacrum, normally disposed,
with one pore between plates, notched slightly in the
sides of the deltoids and radials. There are four coverplate
sockets to each side plate along the main food
groove, and ?two hydrospire folds on each side of an
ambulacrum. The surfaces of the calyx plates are ornamented
by coarse growth ridges parallel to margins.
Occurrence.—Lower Mississippian, upper part of Burlington
Limestone, Louisiana, Missouri.
Types.—Holotype, RX-194, one specimen, Rowley
collection; metatypes, RX-22, three specimens, Rowley
collection, Department of Geology, University of Illinois,
Urbana.
Genus CORDYLOBLASTUS Fay, n. gen.
Type-species, by original designation (herein).—Pentremites acutangulus
SCHULTZE, 1867 (adv. publ., 1866).
Generic diagnosis.—Spiraculate blastoids with five
spiracles, one of which is an anispiracle located between
a superdeltoid and hypodeltoid, with two internal
cryptodeltoids and large hypodeltoid, seen in
side view, but the other four deltoids are overlapped
by radials and not visible in side view, a single pore
occurring between adjacent side plates along radial
margins, lancet covered by side plates, four to nine
hydrospire folds on each side of an ambulacrum; calyx
club-shaped in side view. Devonian, Germany, Spain.
FIGURE
PAGE
1-3. Orophocrinus cam panulatus (I-Luvomcu), syntype, S3,236,
coll. (purchased by SPRINGER), U.S. Natl. Mus.; Lower
Mississippian, Chouteau Limestone, Sedalia, Mo.; oral, "D"
ambulacral, aboral views of HAMBACH'S original figured
specimen (all X3.1) 36
4-9. Orophocrinus stelliformis (OwEN & SHUMARD), neotypes,
S4,961 (new holotype figs. 4,7,9, new paratype fig. 8),
Springer coll., old number S3,234, U.S. Natl. Mus.; Lower
EXPLANATION OF PLATE 13
Mississippian, Lower Burlington Limestone, Burlington,
Iowa; 44, oral, "D" ambulacral, aboral views (all X2.5)
(also figured by ETHERIDGE & CARPENTER, 1886, pl. 15,
fig. 11); 7, oral view of oral plates of holotype, A indicating
anal side ( X30); 8, anal view of new paratype
showing anal covering plates in place between epideltoid
and hypodeltoid plates ( X25); 9, detail view of "B" ambulacrum,
mouth toward top, one outer side plate outlined
in white ( X44) 36