thiolliericrinid crinoids from the lower cretaceous of crimea

— 645 —D ia g n o s is :The radiais have high external surface. The largebasais are visible on the calyx surface. The cirrus socketsand fossae are absent. The centrodorsal is smalland conical. The stem facet is small, rounded andflat.T y p e l o c a l it y :Kuibyshevo, Belbek Valley, Crimea.T y p e l e v e l :Upper Berriasian.Co m p a r i s o n :Conoideocrinus differs from other genera of thefamily having high-conical calyx with large basais andwith no trace of the cirrus socket or fossa.One type species.Lower Cretaceous (Berriasian) ; Crimea.D e s c r i p t i o n :The calyx is high-conical, smooth and rounded. Theexternal radial surface is very high. The sutures betweenthe radiais, basais and the centrodorsal arehardly visible. Radial facets are narrow. The calyxcavity is broad and deep. Radial and interradial furrowsare weak. The height of the centrodorsal is smallerthan that of the radial ring. The centrodorsal basisis rounded and flat with a pronounced fulcral ridge.Conoideocrinus conoideus nov. sp.D e r iv a t io n o m i n i s :fig. 10 AThe name of the species comes from « conoideus »(cone-shaped in Latin).D i m e n s i o n s :H t = 7.9 mm ; Dt = 11.0 mm ; Dc = 6.2 mm ; Af= 26° ; Hr : H t = 0.51 - 0.72 ; Bf : Lf = 0.33 - 0.38.M a t e r i a l :One calyx (see table 1).H o l o t y p e :CK-97-1 (fig. 10 A) ; Leningrad Mining Institute.D i s t r i b u t i o n :Berriasian ; Crimea.Fig. 10 — Calyxes and brachials of Conoideocrinus and Umbocrinus (x 3).A - C. conoideus, holotype CK-97-1 (calyx from side).В - U. umbonatus, CK-89-4 (small calyx from side).С - U. umbonatus, CK-83-2 (calyx from side).D - U. umbonatus, CK-83-6 (odd secondbrachial from above - on the left, and from below - on the right).Е - U. umbonatus, CK-83-7 (even secondbrachial from above).Coupes dorsales et brachiales de Conoideocrinus et Umbocrinus.A - C. conoideus, holotype CK-97-1 (coupe dorsale vue de côté).B - U. umbonatus, CK-89-4 (petite coupe dorsale vue de côté).С - U. umbonatus, CK-83-2 (coupe dorsale vue de côté).D - U. umbonatus, CK-83-6 (secundibrachiale impaire vue en dessus - à gauche, vue en dessous - à droite).E - U. umbonatus, CK-83-7 (secundibrachiale paire vue en dessus).