PLATE XXXIII. 



Page 

 Dizygoceinus okiginakius W. and Sp. 421 



Fig. la. The type specimen. 



lb. Specimen with one arm paired, the others single. 



Eeetmoceinus inteemedius W. and Sp . 404 



2a. Side view of a specimen with arms. 



2b. Another example. 



2c. Another specimen; top view, showing the spatulate, infolding arms. 



Dizygoceinus montgomeeyensis (Worthen) 428 



3. Specimen with arms, anal tube, and stem ; from Crawfordsville, Ind. 



4. Another specimen with arms (all paired but one) ; from Keokuk, Iowa. 



Dizygoceinus montgomeeyensis var. unibeachiatus W. and Sp. 429 



5a. A somewhat abnormal specimen with arms and stem. (Coll. L. A. Cox.) 

 5b. Another specimen with arms. (Same collection.) 

 5c. Posterior view of another specimen. 



Dizygoceinus indianensis L. and C 415 



6a. Postero-lateral side of a specimen with arms. 

 6b. Calyx of another specimen, exposing anal side. 



Dizigoceinus indianensis var. simplex W. and Sp. 415 



7. Anterior view of a specimen with arms. 



Dizygoceinus cantonensis W. and Sp 423 



8ft. Specimen with portions of the arms, and showing anal tube. 

 8b. Another specimen, showing the arms and anal tube. 



Dizygoceinus bituebinatus (Hall) . 427 



9. Lateral view of the calyx. 



Dizygoceinus Whitei W. and Sp 419 



10ft. Specimen with arms from the Keokuk group of Bono, Ind. 

 10Z>. Lateral view of the calyx. (Same locality.) 



11. Posterior view of the calyx. (Specimen from the Warsaw limestone of 



Kentucky.) 



Dizygoceinus eacetus Miller and Gurley 418 



12. Specimen from Canton, Ind., showing anal interradius. 



(All specimens in the collection of Wachsmuth ' and Springer, unless other- 

 wise stated.) 



