21 



BATOCRINUS LABELLUM, D. sp. 



Plate 2, Fig. 10, azygous side; Fig. 11, basal view; Fig. 12, 



summit view. 



This species is medium size, depressed, biturbinate or resembling 

 in outline a doable convex; leas. (Jalys and vault subeiiual. 

 Calyx saucer-shaped, about two and a half times as wide as high. 

 Plates convex or transversely ridged, by being beveled toward the 

 sutures, which are remarkably well defined. Ambulacral openings 

 directed upwards at an angle of twenty degrees and not visible in 

 a basal view. 



The basals extend a little beyond the column and form a sub- 

 hexagonal band around the superior end of it, with a concave de- 

 pression radiately furrowed for its attachment, and in this respect, 

 resembles Balocrinus arcula. First primary radials short, two or 

 three times as wide as long, three liexHgonal, tvo lieptagonal. 

 Second primary radials short, about twice as wide as long, (quad- 

 rangular. Third primary radials a little larger than the second, 

 three pentagonal, two hexagonal, axillary, and in four of the rays 

 supporting upon each upper sloping side two secondary radials, 

 the second one of which is axillary and bears upon each superior 

 sloping side three tertiary radials which gives to each of these 

 rays four arms. In the ray opposite the azygous area the third 

 primary radial bears upon each upper side four secondary radials 

 which gives to this ray two arms. There are, therefore, eighteen 

 arms in this species and eighteen ambulacral openings to the 

 vault. 



There are three plates in each of three regular interradial areas, 

 one large plate followed by two small ones. In the other area 

 there are four plates, one large plate followed by two small ones 

 in the second range and these by one in the third range. The 

 azygous area is sub-ovate, in outline, and contains eight plates. 

 The first is in line with the first primary radials and of about the 

 same size. It is followed by three plates in the second range, and 

 these by three plates in third range, above which, a single plate 

 separates the first tertiary radials, while the second tertiary radials 

 unite over its superior angle. 



The vault is about the same size as the calyx and very much 

 like it in outline. It is covered with numerous, tumid, polygonal 

 plates, each of which bears a central node. There are two pores 

 that penetrate the vault between each pair of arms or eighteen 

 of these so-called ovarian apertures in the species. 



