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 DORYCEINUS UNISPINA (Hall) 467 



Fig. 12. Specimen witli an unusually large spine and portions of tlie arms. 



DoEYCEiNUS MissouKiENSis (Sliumard) 463 



13u. Anterior view of the calyx witli spines intact. 



13i. Ventral aspect of the same specimen. 



13c. Posterior view of another specimen. 



14. An abnormal specimen ; posterior side. 



DoKTCEiNus KcEMEEi M. and W 464 



15a. Anterior view of the calyx. 



151j. Posterior view of another specimen. 



(All specimens, except 6 and 7b, in the collection of Wachsmuth and Springer.) 



