20 



First primary radials wider than long, very tumid, three 

 hexagonal, two heptagonal. Second primary radials small, 

 quadrangular, three or four times as wide as long. Third 

 primary radials twice as large as the second, pentagonal, ax- 

 illary, and support on each upper sloping side two secondary 

 radials, the last of which are axillary and support on each 

 upper sloping side two tertiary radials, except in the arms 

 adjoining the azygous area w T here there are three, which ar- 

 rangement gives to each ray four arms. There are, therefore, 

 twenty arms in this species. 



None of the interradial areas connect with the vault. There 

 is a single plate in the regular interradial area, on the right 

 of the azygous area, and two plates in each of the other regu- 

 lar interradial areas, the first one large, the second one smaller. 

 Azygous area subovate and contains eight plates. The first 

 one is in line w T ith the first primary radials and fully as large. 

 It is followed by three plates in the second range, three plates 

 in the third range, and one small plate in the fourth range, 

 which is cut off from the vault by the third tertiary radials. 



The vault is convex and covered with tumid polygonal plates, 

 and bears a rather large subcentral proboscis. 



This species is distinguished from all other twenty-armed 

 species by the third tertiary radials adjoining the azygous area 

 and by the form of the azygous area and the number of plates 

 it contains. It is unnecessary to carry the comparison further. 



Pound in the Burlington Group, at Sedalia, Missouri, and 

 now in the collection of P. A. Sampson. 



BATOCRINUS SPURIUS, n. Sp. 



Plate II, Fig. 7, one of the azygous sides; Fig. 8, the other azygous 

 side; Fig. 9, opposite view. 



The specimen to which we have attached the name above is 

 medium size, robust, has only four rays, eighteen arms and 

 two azygous areas. If it is abnormal, we are unable to refer 

 it to any described species, and as it is extraordinary and 

 bears no evidence of ever having been injured, we think wo 

 are justified in giving it a name and describing it. 



It is biturbinate. Plates convex or tumid. 



