PLATE XLIIT. 



Pack 

 DoRYfRiNrs MississippiENSis F. Ecemer 455 



Fig. 1. Specimen witli anus aud stem. (Coll. Lisbon A. Cox.) 



DoEYCRixus GouLDi (Hall) 456 



L'. Large specimen with arms and stem. (Coll. W. and Sp.) 



3. A young specimen with arms. (Same collection.) 



AoROCRiNus spixosuLus (Hall) 478 



4. Specimen with arms. (Coll. L. A. Cdx.) 



DOBYCRINUS COKNIGERUS (Hall) 458 



5. Calyx, showing the anal side. (Coll. W. and Sp.) 



DoRYCEiNus MissouEiENSis (Sliumard) 4G3 



C. Posterior side of the calyx with most of the spines intact. (Same collection.) 



AGARicocEiisrus NODULOsus Worthen 497 



7". Dorsal aspect of the calyx. (Same collection.) 

 7/>., Ventral aspect of the calyx. 



Agaeicoceinus Whitfieldi Hall 496 



S<(. Dorsal aspect of the type specimen. (Illiuois State collection.) 

 8b. Ventral aspect of the same specimen. 



Agaeicoceinus nodosus Meek and Worthen 493 



9. Calyx aud portion of the arms. (Coll. W. and Sp.) 



