PLATE XXXV. 



Page 



Macrockinus Konincki (Shumard) 447 



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



2. Calyx, showing anal side. 



3. Another specimen, showing anterior side. 



Mackocbinus lagunculus (Hall) 453 



4. Calyx, postero-lateral side. 



DizYGOCEiNus indianensis (Lvon) 415 



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



terior rays mostly single in the specimen. 



DiziGOCRiNus DECOEis (Miller) 4^0 



6. Calyx, in a side view. 



DizYGOCKixus EucoNUS (Meek and Worthen) 430 



la. Calyx, showing the postero-lateral ray, and the anal interradius. (A speci- 

 men from Taylor Co., Ky.) 

 76. Dorsal aspect of the same specimen. 



DizYGOCRiNus 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. didactylus W. and Sp 420 



12. Specimen with the arms all paired. 



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



DizYGOCRiNus ORiGiNARius var. ADULTUS W. and Sp 422 



14. Specimen with most of the arms paired. 



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



DizYGOCRixus uxioxENSis (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. 



