PLATE XXXV. 



Page 

 Macrockinus Koxixcki (Shumai-)]) 447 



Fig. 1. Specimen with anal tube, arms, and stem. (Mas. Comp. Zool.) 



2. Calyx, showing anal side. 



3. Another specimen, showing anterior side. 



Mackociunus laguxculus (Hall) 453 



4. Calyx, postero-lateral side. 



DizYGOCRixus iNDiANEN'sis (Lvon) 41.5 



5. The arras of the two posterior rays nearly all paired ; those of the three an- 



terior rays mostly single in the specimen. 



DiziGooKiNus DECORis (Miller) 420 



C. Calyx, in a side view. 



DizYGOCiuxus EucoNUS (Meek and Worthen) 4.30 



7a. Calyx, showing the postero-lateral ray, and the anal iuterradius. (A speci- 

 men from Taylor Co., Ky.) 

 7b. Dorsal aspect of the same specimen. 



DizYGOCRixus MUTABiLis W. and Sp 429 



8. Anterior side of the calyx. 



9. Specimen with arms in a side view. 



10. Specimen with anal tube, and most of the arms paired. 



11. Specimen in which one half of the arms are single. 



DizYGocRiNus Whitei var. didactylts W. and Sp 420 



12. Specimen with the arms all paired. 



13. Specimen in wliich most of the arms are single. 



DizY'^GOCRiNus ORiGiNAKius var. ADULTUS W. and Sp 422 



14. Specimen with most of the arms paired. 



15. Another in which most of the arms arc single. 



DizYGOCRixais uxiONENsis (Worthen) 424 



16. Anterior side of calyx. 



17. Anal side of a crushed specimen. 



18. Side view of another specimen. 



19. Posterior side of a specimen with arms. 



20. Another specimen, showing posterior side. 



