ECHINODERMATA - KU ScholarWorks - University of Kansas

BLASTOID STUDIES 65
complete specimens, University of Kentucky, Lexington.
Plesiotypes, S3,782, 18 specimens, Springer collection, one
illustrated, showing esophageal ring; 71,650, one specimen
in rock figured by BUTTS, 1926, pi. 59, fig. 3, U. S.
National Museum, Washington.
Genus ELAEACRINUS C. F. Roemer, 1851
[=Olivanites (TRoosr, 1849, nom. nud.) LYON, 1857; Eleacrinus
ETHERIDGE & CARPENTER, 1883]
Type-species, by subsequent designation (Shumard, 1863).—E/acacrinus
verneuili ROEMER, 1851 (=Pentretnites verneuili TROOST,
1841, nom. nod.).
Generic diagnosis.—Spiraculate blastoids with 11
openings around oral opening, consisting of ten spiracles
and anus separate, approximately 18-21 oral plates,
one of which may not be an oral but an exposed
superdeltoid plate, with three other exposed anal
plates or two cryptodeltoids and hypodeltoid, one or
two anal orals between adorai tips or cryptodeltoids;
lancet covered by side plates, an inner side plate present,
a single pore between side plates along deltoid and
radial margins; deltoids long, overlapping radials,
with two hydrospire folds on each side of an ambulacrum
with medium-long hydrospire canal; form of
calyx ellipsoidal, longer than wide. Devonian, Ohio,
Indiana, Kentucky, Missouri.
Remarks.—The genus Elaeacrinus was probably
derived from a genus related to Troosticrinus, in
which the small cryptodeltoids moved outward to the
exterior, crowding the hypodeltoid between them,
the superdeltoid began to migrate inward, the hydrospires
became reduced to two on each side of an ambulacrum
due to atrophy, the deltoids migrated downward,
and many small oral plates coalesced to form a
few large orals (18-21).
ELAEACRINUS VERNEUILI C. F. Roemer
Plate 28, figures 7-10; text-figs. 120, 121
Pentremites verneuili TROOST, 1841, p. 14 (nom. nod.).
Pentatrematites verneuili BRONN, 1848, p. 946 (nom. nod.).
Olivanites verneuili TROOST, 1849, p. 419 (nom, nod.); typespecies
of Olivanites.
Elaeacrinus verneuili ROEMER, 1851, p. 379, pl. 8, figs. la-d (typespecies
of Elaeacrinus).
Description.—Calyx calcitic, ellipsoidal in side view,
subcircular in top view, 36 mm. long by 28 mm. wide,
FIGURE 120. Elaeacrinus verneuili ROEMER, Middle Devonian,
Jeffersonville Limestone, Jeffersonville, Indiana
(Univ. Chicago, no. 9,956); summit area, X8. [Explanation.—An,
anal opening; "C," amb.; CR, cryptodeltoid;
"D," amb.; HD, hypodeltoid; 0, oral plate; S, spiracle;
Su, superdeltoid.]
EXPLANATION OF PLATE 18
FIGURE PAGE
1-7. Sagittoblastus tvanneri (Y Axovt,Ev), metatype, 102,187
(figs. 1-3), U.S. Natl. Mus., Permian, Krasnoufimsk,
Urals, Russia; 1-3, oral, "D" ambulacral, aboral views of
weathered specimen (all X6.7); metatype, 695, (figs. 4-7),
Illinois Geol. Survey, Permian, Krasnoufimsk, Urals, Russia;
4-6, oral, "D" ambulacral, aboral views ( X4.9);
7, detail view of "AB" deltoid showing three hydrospire
slits on each side in deep concavity ( X20.6) 44
8,9. Orophocrinus sirius (WHITE), holotype, 379, Harvard
Mus. Comp. Zoology; Lower Mississippian, Burlington
Limestone, Burlington, Iowa; oral and aboral views showing
winglike radials ( X4) 39
1 0, 11. Pterotoblastus gracilis WANNER, topotype, S4,035,
Springer coll., U.S. Natl. Mus.; Permian, Basleo beds, from
Tonino, Kioe Kilo, near Basle°, Timor Island, East Indies;
10, detail oral view of oral area (approximately
X5.5); 11, "B" ambulacral view (approximately X2.5) 44
12. Thaumatoblastos longiramus WANNER, topotype, S4,053,
Springer coll., U.S. Natl. Mus.; Permian, Basleo beds,
Basleo, Timor Island, East Indies; oral view of radial fragment
showing side plates (X7) 45