26 BULLETIN NO. 2. 



Basals short and forming a projecting rim around the cokimnar 

 facet. First radical series 3x5; the first one hexagonal or hep- 

 tagonal, nearly twice as wide as long. The second is quadrangu- 

 lar, about the same length as the first, and two-thirds as wide; 

 the third wider than long, axillary, and supporting the first of the 

 secondary series. The anterior ray has three secondary radials 

 in each division. In the postero-lateral rays, the secondary radial 

 series consists of five plates, three on one side and two on the 

 other, the second plate on one side being an axillary plate which 

 supports on each side the tertiary radials. 



The antero-lateral rays have two series of secondary radials, 

 consisting of two plates each, the upper one of which is axillary, 

 and supports a double series of tertiary radials. 



This gives an arm formula of two arms to the anterior ray, 

 three each to the postero-lateral rays, and four each to the 

 antero-laterals. 



First anal plate as wide as long, heptagonal, supporting three 

 plates above in the first series, five in the second, and three m 

 the third, the middle one of the last series projecting about one- 

 half its length above the others. 



First interradial about as large as the first anal, and supports 

 two smaller interradials above. 



This species in its general form resembles Batocrinus hitiirbina- 

 tus, but the body is more spreading below the arms, the dome 

 is more inflated, with fiat nodose instead of convex plates. Arm 

 openings directed upward. 



Position and locality: Keokuk limestone, Montgomery county, 

 Indiana. 



The author's collection. 



BATOCRINUS SUBCONICUS. (sp. llOV.) 



There is another form occurring near the same horizon as the 

 preceding, which resembles it somewhat in general form, but pos- 

 sessing characters that render it clearly distinct. The calyx is 

 more expanded in proportion to its height than that of B. Mont- 

 gomeryensis, and is composed of flat instead of convex plates, Jf 

 with no projecting rim formed by the basal plates as in that spe- 

 cies. 



The dome is obtusely conical, composed of convex plates, and 

 twice as long as the calyx below the arms, sloping up regularly 

 and symmetrically into a rather stout, central, ventral tube. 



The calyx below the arms is nearly four times as wide as high, 

 with the arm openings directed outward, and arm formula about 

 the same as in B. Montgomeryensis. The specimen is so highly 

 silicified that the form and number of the secondary and tertiaiy 

 radials cannot be clearly determined. 



The author's collection. ^. 



