BATOCEINID^. 415 



Dizygocrinus indianensis (Lyon and Cass). 

 Plate XXXIII. Figs. 6a, h, and Plate XXXV., Fig. 5. 



I860. 



Actimcrimis hidianensis — Lton aud Cass. ; Arner. Journ. Sci., Vol. XXIX., p. 75. 

 1873. Actbwcnims indianensis — Meek aud Woethen; Geol. Eep. Illinois, Vol. V., p. 341. 

 1881. Batocrinus indianensis — W. and Sp. ; Revision Palseocr., Part 11., p. 166. 

 188i. Batocrinus indianensis — Quenstebt ; Handb. der Petrefactenkunde, Plate 77, Figs. 6«, b. 



Calyx below medium size, biturbinate to subglobose, about as wide as 

 high ; the dorsal cup a little higher than the ventral disk. The sides of the 

 cup slightly convex, expanding almost uniformly from the base to the arm 

 regions; the rays well defined by undulated angular ridges following the 

 median portions of the plates. In addition to these ridges, the surface 

 of all radial as well as interradial plates is covered by a variety of promi- 

 nences and depressions, which give to the ornamentation a hieroglyphic 

 appearance. 



Basals short, slightly projecting, hexagonal in outline ; interbasal suture 

 lines impressed. Radials twice as wide as long, covered with three stellate 

 prominences, which, being confluent, form a transverse ridge. First costals 

 quadrangular, shorter and narrower than the radials, the sides convex, the 

 median ridge crossed either by a transverse node, or by a row of small tuber- 

 cles transversely arranged. Second costals generally heptagonal and a little 

 wider than the first, their median portions raised into small tubercles. 

 Distichals rather large, nearly as long as wide ; they consist in the an- 

 terior ray of 4 X 2 plates, in the four others of 2X2, which are followed 

 by 3 X 2 fixed palmars. Arms thirty-six (exceptionally forty), two from 

 each arm opening ; long, slightly flattened and infolding at their tips ; they 

 are biserial from their bases up, and the plates connected vertically by wav- 

 ing sutures. The upper border of each arm plate is covered by two or more 

 small tubercles, which project over the lower end of the succeeding plate, 

 giving to the surface a file-like appearance. Pinnules long, cylindrical, com- 

 posed of about thirteen elongate joints. Interbrachials : 1, 2, 1, and one or 

 two additional pieces between the arm bases. The first plate is considerably 

 larger than the others, wider than high; it is covered by a central, irregu- 

 larly stellate node, surrounded by numerous small granules ; the upper plates 

 elongate and similarly ornamented. Anal plate a little narrower than the 

 radials; followed by 3, 3, 2, and 2 pieces, which interlock with the inter- 

 ambulacral plates above. Ventral disk depressed conical ; the plates small 



