103. CONTRIBUTION TO 



The radial nodes are connected by a strong rounded ridge, forking on the 

 third radial. 



The first interradials are not larger than the first radials, convex, and 

 with a strong central node from which radiate to adjoining plates six to eight 

 ridges. 



The second interradial has a tiiberculose node. 



The ventral disk is contracted and with no ornamentation preserved, the 

 plates however, being a little convex. 



The base of the proboscis is strong and nearly central. There are but ten 

 arms, two to the ray. 



The anal interradial on this specimen, has a stronger node on the second 

 interradial plate, than on the same plate in the other interradial areas. 



There are two respiratory pores to the arm group or ten in all. 



This fossil is scarcely wider than long. 



Miller and Gurley's type of this species had eleven arms. 



Horizon, locality and collection same as the last. 



MEGISTOCRINUS EXPANSUS, var. Magniventrus, 

 N. var. (Rowley). 



Plate 32. Figs. 19, 20, 21. 



The general appearance of this fossil is like an overgrown Aorocrinus par- 

 vus, such as we sometimes find in the Burlington limestone. 



The region of the arm bases presents the greatest width of the fossil. 



The arm openings are directed obliquely upward. The ventral disk is tu- 

 mid at the center, apparently smooth, with two or three hardly outlined nodes. 



There are sixteen arm bases, 4, 2, 4, 2, 4. 



The plates of the calyx are a little depressed. 



The base is almost flat and beyond this area the calyx rapidly expands to 

 the spreading arm bases, giving the appearance of a broad pan. 



The respiratory pores are very small. 



The ornamentation of the calyx is wavy radiate lines. 



Horizon, locality and collection same as the last. 



STEPHANOCRINUS, DEFORMIS, NiSp. (Rowley). 



Plate 32. Figs. 22, 23. 



This is the most elongate form of the genus we have yet seen. It is deep, 

 obconical and with a trigonal base. Column small, round. 



