PLATE LXXV. 



Pack 



Camptocrinus myf.lodactylus TV. and Sp jj'j 



Fig. 1. A specimen with stem and cirri. (Coll. W. and Sp.) 



2'« and b. Portions of the coiled stem in different specimens, showing the cirri. 



DiCHOCRiNus Blaiei S. a. Jliller 778 



3. The type specimen. (After Miller.) 



DiCHOCRiNus HuxTsviLL.E W. and Sp 77;; 



4. The type specimen. (Coll. W. and Sp.) 



DrciiocRiNus ciNcTus S. A. INfiLLER 7C4 



5. Specimen with arms. (Same collection.) 



DicHOCRixus coxus Meek and Worthen 770 



C. The type specimen. (Illinois State collection.) 



Plattcrinus canaliculatus Hall 68!) 



7a. Specimen with arms. (Coll. W. and Sp.) 



lb. Dorsal aspect of the calyx. (Same collection.) 



Platycrixus scuLPTis Hall 0)91 



8. A large specimen with arms. (Same collection.) 



9. A smaller specimen. (Mus. Comp. Zool.) 



Platy'^crinus americaxus 0. and Sh 6S6 



10. A mature specimen with arms; the latter biserial from above the last bifur- 



cation. (Coll. W. and Sp.) 



11. A young specimen; the arms uniserial and zigzag, the joints elongate, and 



the pinnules far apart. (Same collection.) 



12. Dorsal aspect of the caly.K. (Same collection.) 



13a. Side view of the calyx of a large specimen. (Same collection.) 

 13i. Anal side of the same specimen. 

 13r. Ventral aspect of the same. 



14. Natural cast, probably of Culicocrixus 7.35 



From the Niagara group of Iowa. (Same collection.) 



