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DORYCKINCS UNISPIXA (Hall) 467 



Fig. 12. Specimen with an unusually large spine and portions of the arms. 



DoEYCKiNus MissouRiENSis (Shuuiard) 463 



]3«. Anterior view of the calyx with spines intact. 



13b. Ventral aspect of the same specimen. 



13c. Posterior view of another specimen. 



14. An abnormal specimen ; posterior side. 



DoRYCiUNUs RcEMEEi M. and W 464 



15a. Anterior view of the calyx. 



15^'. Posterior view of another specimen. 



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



