PLATE XL 



Page 

 Diaboloceinus peeplexus W. and Sp 250 



Fig. la. Dorsal view of a large calyx, showing very small supplementary pieces 

 along the sides of the radials and between the interradials. 

 lb. Ventral aspect of the same. 



Diaboloceinus vespeealis White 251 



lc. Lateral view of a specimen in which no supplementary pieces are developed. 

 Id, Lateral view of a specimen in which the primary interradials are completely 



separated from the radials by supplementary pieces. (All in Coll. W. 



and Sp.) 



Khaphanoceinus subnodosus (Walcott) 259 



2. The type specimen. (Mus. Comp. Zool.) 



Khaphanoceinus sculptus (Miller) 260 



3. A specimen with arms. (Coll. I. H. Harris.) 



Lyeioceinus mblissa (Hall) 263 



£«. A specimen with arms. (After Hall.) 



Ab. Dorsal aspect of a large specimen. (Coll. W. and Sp.) 



4c. Ventral aspect, showing portion of the tegmen. (Coll. W. F. E. Gurley.) 



4<Z. A smaller specimen, with the tegmen preserved, and showing the anus. 



(Coll. W. and Sp.) 

 4e. Lateral view of the calyx. (Coll. W. F. E. Gurley.) 

 If. A young specimen with arms. (Coll. W. and Sp.) 



Lyeioceinus dactylus Hall 262 



Ba and b. The types. (Amer. Mus. Nat. Hist., New York.) 

 Bo. Specimen showing the pinnules. (Mus. Comp. Zool.) 



Ehodoceinus Woetheni Hall 220 



6. A slightly crushed specimen with arms. (Mus. Comp. Zool.) 



Ehodoceinus nanus M. and W 228 



la. The type specimen, lateral view ; from the Burlington Limestone. 

 lb. Ventral aspect of the same. (Mus. Comp. Zool.) 



