PLATE XXIV. 



Pace 

 Hadrockinus discus Lyon 328 



Fig. 1. The type specimen ; dorsal aspect. (Coll. S. S. Lyon.) 



Hadeoceinus plenissimus Lyon 328 



2a. The type specimen; dorsal aspect. (Coll. S. S. Lyon.) 

 2b. Inner floor of dorsal cup. (Same collection.) 



Technooeinus Andrewsi Hall 306 



3. The type specimen, after Hall. (From a gutta percha cast made from 

 a natural mould in sandstone.) 



Meloceinus pachydactylus (Hall) 296 



4a. The type specimen. (After Hall.) 



il). Another specimen. (Am. Mus. Nat. Hist.) 



Meloceinus bainbeidgensis Hall and Whitf 297 



5. The specimen described by S. H. Williams as Melocrinus Clarkei, (N. Y. 



State Cabinet of Nat. Hist.) 



(?) Stelidioceinus aegutus (Walcott) 280 



6. The type specimen. (After Walcott. Coll. Mus. Comp. Zodl.) 



Alloceinus typus W. and Sp 307 



7a. Side view of one of the types. (Coll. W. and Sp.) 

 7b, Basal view of same specimen. 



Alloceinus Benedicti S. A. Miller 308 



8a. Side view of calyx. (Same collection.) 

 8b. Basal view of same specimen. 



