J7J. CONTRIBUTION TO 



The ornamentation of the plates of the dorsal cup consists of fine, indis- 

 tinct radial lines and low radiating ridges. 



The final radial is broader than long and has a slight cross ridge. The 

 second radial is quadrangular, broader than long, and has a low cross ridge. 

 The third radial is pentagonal, broader than long, and has a cross ridge as in 

 the first and second plates. There is another bifurcation above the third pri- 

 mary radial. A slender thread-like line traverses the radial series from the 

 base to the arms. The first interradial plate sends off indistinct radiating 

 ridges from the center. Above this latier plate are one or two smaller plates. 

 There are eighteen arm bases, four to the ray, except the one opposite to 

 the anal area, which has but two. To each group there are two large respira- 

 tory pores or ten in all. 



^ The plates of the ventral disk are strongly nodose and the nodes are sharp. 



The ornamentation of the dorsal cup reminds one of delicate ripples. The 

 proboscis (ventral tube) is stout, long and nodose. 



The plates are rather thick. 



This crinoid comes from the Warsaw Limestone of Lanesville, Ind., and 

 the specimen figured belongs to the G. K. Greene collection. 



BATOCRINUS IRREGULARIS, Casseday, Rowley. 



Plate 51. Figs. 4, 5, 6. 



The columnar canal is large. The basal plates form a slight rim. All of 

 the radial plates are much wider than long, and each with a prominent cross 

 ridge or convexity; an almost absolute line connects the convexities and passes 

 to the arm bases. The first interradial is nine or ten sided and convex or wart- 

 like, with one or two small interradials above it. 



Resting upon the first azygous interradial are five smaller anal plates. 

 Above these latter is another series of several plates. As in the preceding 

 species there are eighteen arm openings and with the same arrangement of re- 

 spiratory pores, but smaller. 



The plates of the ventral disk are convex, three of them just over each 

 arm group are nodose, except over the two armed ray, where but a single node 

 occurs. The anal tube is nearly central and strong. Probably nodose. 



Horizon, locality and collection same as the last. 



BATOCRINUS DAVISI, Rowley. 



Plate 5L Figs. 7, 8, 9. 

 This is another 18-armed form, with convex calix plates, the latter orna- 



