ECHINODERMATA - KU ScholarWorks - University of Kansas

40 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
Genus PHAENOBLASTUS Fay, n.gen.
Type-species, by original designation (herein).—Pentremites caryophyllatus
DEKONINCK, 1854.
Generic diagnosis.—Fissiculate blastoids with ten
hydrospire fields (mostly hidden), an epideltoid and
hypodeltoid, with a reduced number of hydrospire
slits on the anal side, lancet plate completely exposed;
calyx club-shaped in side view. Lower Carboniferous,
Belgium.
Remarks.—The genus Phaenoblastus was probably
derived from Phaenoschisma by the outward
migration of the lancet plate, and Phaenoschisma was
probably derived from Deltoschisma by fusion of the
cryptodeltoids and superdeltoid into an epideltoid.
PHAENOBLASTUS CARYOPHYLLATUS
(de Koninck & Lehon)
Plate 14, figures 2-3, 5-6, 8, 10; text-figs. 46-48
Pentremites caryophyllatus DE KONINCK 8c LEHON, 1854, p. 197, pl.
7, figs. 3a-c.
Description.—Calyx calcitic, obconical in side view,
rounded pentagonal in top view, 12 mm. long by 8 mm.
wide, vault 6 mm. long, pelvis 6 mm. long, pelvic angle
65 degrees, summit rounded, base conical, and periphery
44
1n1
43
45
FIGURES 42-45. Pentrernitidea pailletti (DE VERNEUIL),
Devonian, Spain (Harvard Mus. Comp. Zoology, nos.
297, 547; U.S. Natl. Mus. no. S3,621). 42. Plate arrangement
of anal area (no. 297), x15.-43. Cross
section of "B" ambulacrum (no. S3,621), X15.-44.
Cross section of "B" ambulacrum near radial lip (no.
547), x15. 45. Part of "E" ambulacrum, showing
main, inner, and outer side plates (no. 297), X45. [Explanation.—"A,"
amb.; An, anal opening; Bf, brachiolar
facet; Bp, brachiolar pit; "C," amb.; C, canal (radial);
"D," amb.; Db, deltoid body; Dc, deltoid crest; D1, deltoid
lip; Ds, deltoid septum; HD, hypodeltoid; ISp, inner
side plate; L, lancet; 0, oral opening; OSp, outer side
plate; R, radial; RI, radial limb; Sp, main side plate; Ss,
spiracular slit; Su, superdeltoid; Sub, subdeltoidd
EXPLANATION OF PLATE 7
FIGURE PAGE
1-8. Hyperoblastus preciosus (RE.ImANN), holotype, E15,934,
Charles Southworth coll., Buffalo Soc. Nat. Sci.; Devonian,
Hungry Hollow Formation (coral zone), Joseph Bell's
Quarry, Thedford, Ontario; 1-3, oral, "D" ambulacral, aboral
views (X4.4); 4, oral view of oral area ( X8.8); 5,
anal view showing two prominent cryptodeltoids ( X10.6);
6, tangential view of interior right side of "E" ambulacrum
showing nature of branching of a hydrospire canal
or slit beneath deltoid (X13.2); 7, side view of "E" ambulacrum
with lancet removed ( X6.8); 8, side view of
"B" ambulacrum showing large gaps between side plates
(X13.2) 31
9. Hyperoblastus filosus (WHITEAvEs), holotype, 3,660, Rev
H. Currie coll., identified by WHITEAVES, Geol. Survey
Canada; Devonian, Hamilton beds, near Thedford, Ontario;
"C" ambulacral view showing gaps between side
plates (X15.3) 32