84 PALAEONTOLOGY OF ILLINOIS. 



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

 twojmialler interradials above. 



This species in its general form resembles Batocrinus biturbina- 

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

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

 openings directed upward. 



Position and locality : Keokuk limestone, Montgomery county, 

 Indiana. 



Collection of A. H. Worthen. 



BATOCRINUS SUBCONICUS. (sp. nov.) 



PI. XIII, Figs. 4-ia. 



Batocrimts sulconicus, Worthen. March, 1881. Bulletin No. 2 of the Illinois Stato 

 Museum of Natural History, p. 20. 



There is another form occurring near the same horizon as the 

 preceding, which resembles it somewhat in general form, but 

 possesses characters that render it clearly distinct. The calyx 

 is more expanded in proportion to its height than that of Ji. 

 montgomeryensis, and is composed of flat instead of convex 

 plates, with no projecting rim formed by the basal plates as in 

 that species. 



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 a,rms is nearly four times as wide as high, 

 with the arm openings directed outward, and arm formula about 

 the same as in B. montgomeryenxis,. The specimen is so highly 

 silicified that the form and number of Ilic secondary <md teHiai-y 

 radials cannot be clearly determined. 



Collection of A. H. Worthen. 



BATOCRINUS UNIONKNSIS. (sp. nov.) 



PI. XII, Figs. 5-5a, and PI. XIII, Fig. 3. 



Body depressed globose, width at the base of the arms a little 

 greater than the height to the base of the ventral tube. 



Plates of the calyx strongly beveled on their borders, leaving 

 a deep suture between them on all sides. 



Dome elevated, composed of plates that are elevated in the 

 center, forming short and rather stout nodes. 



