ECHINODERMATA - KU ScholarWorks - University of Kansas

74 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
Genus GRANATOCRINUS Hall, 1862
Type-species, by subsequent designation (Shumard, 1866).—Pentatrematites
granulatus ROEMER, 1851.
Generic diagnosis. — Spi raculate blastoids with
eight spiracles in addition to an anispiracle, which occurs
between epideltoid and hypodeltoid plates; lancet
covered by side plates; hydrospire plate present; two
pores to each side plate along margins of radials and
deltoids, radials overlapping deltoids, one hydrospire
fold on each side of an ambulacrum, deltoids moderately
long, shape elliptical. Mississippian, Kentucky,
Indiana, Tennessee.
Remarks.—The genus Granatocrinus was probably
derived from a form similar to Poroblastus in which
the marginal pores along the deltoids were infolded to
form two sets of pores to each side plate, and the mature
form had a tendency to increase in size.
GRANATOCRINUS GRANULATUS (Roemer)
Plate 39, figures 3-9
Pentatrematites granulatus ROEMER, 1851, p. 363, pl. 13, fig. 13.
Granatocrinites cidariformis TROOST, 1849, p. 420 (nomen nudum).
Cidaroblastus granularis HAMBACH, 1903, pl. 3, fig. 2.
Orbitremites oppelti ROWLEY, 1902, p. 86, pl. 29, figs. 15-20.
Description.—A long description has been given by
CoNKIN (1957, pp. 139-140) but this should be altered
slightly. There are eight spiracles in addition to an anispiracle
around the oral opening, the anispiracle occurring
between epideltoid and hypodeltoid plates. A hydrospire
plate is present and approximately two pores to each
side plate occur along the ambulacral margins of the
deltoids and radials. A single long hydrospire fold is seen
on each side of an ambulacrum, and radials overlap the
deltoids. The base is deeply concave. Ornamentation consists
of large rounded spines more or less arranged along
growth lines.
Remarks.—This form would be placed in a new
genus except that the name Granatocrinus is available,
and therefore, the name is revived but restricted to forms
that fit the above generic diagnosis.
Occurrence.—Lower Mississippian, Coral Ridge member
of New Providence Formation, east quarry of Coral
Ridge Brick Company yards, Coral Ridge, southwestern
Jefferson County, Kentucky (127,323). New Providence
Formation, Bedford County, Tennessee (33,080). New
Providence Formation, headwaters of Medlock's Creek,
10 miles south of Lebanon, Marion County, Kentucky
(S3,751).
Types.—Plesiotypes, S3,751, 19 specimens, Springer
collection, filed under the name Orbitremites granulatus,
and on label is "Keokuk, Granulata Troosti?, Marion Co.,
Ky., 10 miles south of Lebanon," from the New Providence
Formation; 33,077, topotypes, two specimens of the
Troost collection, labelled Granatocrinus globosus, from
the New Providence Formation, Bedford County, Tennessee;
33,078, topotypes, labelled Granatocrinites granularis
Troost, from Shelbyville, Tennessee; 33,080, three
topotypes, labelled Granatocrinus cidariformis, Troost
collection, New Providence Formation, Bedford County,
Tennessee; and 127,322, 127,323, two specimens from the
Conkin collection, Coral Ridge, Kentucky, labelled Orbitremites
oppelti. All of the above are in the U. S. National
Museum, Washington, and are here considered to
be conspecific. Plesiotype, S5,746, one specimen, from
Mason County, Kentucky, University of Michigan, Ann
Arbor.
GRANATOCRINUS KENTUCKYENSIS (Conkin)
Plate 40, figures 1-6; text-fig. 143
Orbitremites kentuckyensis CoNxix, 1957, pp. 135-137, pl. 13, figs.
1-20; text-figs. 1B, 1C, 1E.
Description.—CoNKIN's unfigured paratype no. 1 is
described. Calyx pyritic, flattened elliptical in side view,
circular in top view, 15.5 mm. long by 19.5 mm. wide,
with flattened summit, constricted concave base, and
periphery at mid-height. Stem not preserved. Basal circlet
2 to 3 mm. in diameter, pentagonal in aboral view, not
well preserved, in deep basal concavity that is 5 mm.
wide. Radials five, pentagonal in side view, each 12 mm.
long by 11 mm. wide, extending adorally beyond midheight,
strongly recurved below in basal concavity, with
narrow, moderately deep sinus 12 mm. long by 2.5 mm.
wide, with depressed radiodeltoid sutures; radials overlapping
deltoids at a high angle.
Deltoids four, broadly arrow-shaped, long, extending
to mid-height, each 11 mm. long by 9 mm. wide, notched
in the adorai tip by two elongate slitlike spiracles along
ambulacral margins. On the anal side, the broadly pentagonal
V-shaped epideltoid is adjacent to the oral opening,
with a triangular anispiracle between it and the
elongate pentagonal hypodeltoid. The oral opening is
surrounded by four deltoid lips and the epideltoid, and
there are eight spiracles and anispiracle, or nine openings
around the oral aperture.
Ambulacra five, linear, depressed, each 26 mm. long
by 2.5 mm. wide, recurved below, with aproximately 25
side plates in a space of 10 mm. along an ambulacrum.
Detailed features of ambulacra obscure, but the lancet
appears to be covered by side plates. Calyx plates with
wide, high, granular growth ridges parallel to plate margins,
termed chevrons on deltoids, and dalaths on radials.
Occurrence.—Lower Mississippian, lower New Providence
Formation, upper part of Coral Ridge member, east
quarry of Coral Ridge Brick & Tile Company, Coral
Ridge, Jefferson County, Kentucky.
Types.—Paratypes, nos. 1 (139,620) and 2 (139,619)
of CoNxix (1957) unfigured, two specimens, U.S. National
Museum, Washington.