II 



an orifice at each of its inferior angles. This arrangement places 

 one pore on one side of each arm or gives to the species twenty 

 of these so-called ovarian pores. 



This species is distinguished by its general form, cuneiform 

 basal plates, elongated interradial areas, twenty arms and nodose 

 plates. It cannot be mistaken for any hitherto described. 



Found by Prof. A. G. Wetherby, in the Keokuk Group of Ten- 

 nessee and now in the collection of Wm. F. E. Gurley. 



BATOCRINUS WETHERBYI. 



Plate I, Fig. 11, azygous view; Fig. 12, opposite side of same 

 specimen. The outer rim of the basals is broken off. 



Species rather above medium size, biturbinate vault larger than 

 the calyx. Plates of the vault tumid and nodose, while those of 

 the calyx are smooth. Calyx twice as wide as high, truncated 

 and expanded at the base, and broadly constricted in the region 

 of the secondary radials, and having the last tertiary radials 

 directed nearly horizontally. The surface is without radial ridges 

 or other ornamentation except a granular covering. 



The basals are truncated below and broadly expanded, but the 

 outer rim is broken off in our specimen so the true diameter is 

 not disclosed. The column is large and inserted in a concave rad- 

 iately furrowed depression. The first primary radials are very 

 short, from three to four times as wide as long, superior face 

 concave, three hexagonal and two heptagonal. Second primary rad- 

 ials short, from two to three times as wide as long, quadrangular. 

 Third primary radials very little larger than the second, pentag- 

 onal, axillary and supports on each superior sloping side two 

 secondary radials. The secondary radials are larger than the sec- 

 ond and third primary radials and considerably wider. The second 

 secondary radials are axillary and bear on each superior sloping 

 side two rather long tertiary radials. By this arrangement there 

 are twenty arms and twenty ambulacral openings to the vault. 



There is a single very large plate in each of two regular inter- 

 radial areas and two plates in each of the other two areas, one 

 rather large plate followed by a small one as shown in figere 12. 

 There are live azygous plates. The first one is much larger than 

 either of the first primary radials and in line with them. There 

 are three plates in the second range, the middle one being much 

 the smallest and quadrangular. There is a single wide plate in 

 the third range which is nearly as large as the first. The azygous 

 area is, therefore, nearly square in outline, with a small quad- 

 rangular plate in the center surrounded by four plates in the angles 

 of the area. 



