PLATE LXXVIII. 



Pace 

 Talaeoceinus sexlobatus (Shumard) 784 



Fig. la. Posterior view of a specimen from Flagpont, Va. (Y). (Coll. W. and Sp.) 

 15. Ventral aspect of the same specimen Qf). 

 lc. Dorsal view of the calyx. (Coll. W. and Sp.) 



Talaeoceinus ovatus Worthen 787 



2a. Posterior view of the type specimen Qj). (Illinois St. Coll.) 

 25. Ventral aspect of the same specimen ('j 5 ). 



Talaeoceinus decoenis W. and Sp 788 



3a. Posterior view of the type specimen (y s ). (Coll. W. and Sp.) 



36. Ventral aspect of the same ( T '). 



3c. Specimen with arms (y 5 ). (Same collection.) 



Talaeoceinus symmeteicus (Cass, and Lyon) 786 



4a. Posterior view of the calyx (y 5 ). (Coll. W. and Sp.) 



45. Ventral aspect of the same specimen Qf). 



5. Posterior view of type ("). (Coll. S. S. Lyon.) 



Talaeoceinus coenigeeus (Shumard) 783 



6a. Posterior view of a specimen from Pulaski Co., Ky. (Coll. VV. and Sp.) 



65. Ventral aspect of the same specimen ( T 5 ). 



la. Anterior view of the type specimen, from Alabama Qf). (Mus. Washington 



University, St. Louis.) 

 75. Ventral aspect of the same Qf). 



Talaeoceinus simplex (Shumard) 790 



8«. Anterior view of the dorsal cup Q^). (Coll. W. and Sp.) 

 85. Dorsal aspect of a larger specimen. (Same collection.) 



Talaeoceinus sp. (?) 



9a. Posterior view of a specimen from Pulaski Co., Ky. Q-f). Perhaps an ab- 

 normal specimen of T. sexlobatus. (Coll. W. and Sp.) 

 95. Oral plates of the same ('f 5 ). 



Hexaceinus occidentalis W. and Sp 745 



10. Anterior view of the type specimen. (Mus. Davenport Acad. Nat. Sci.) 



