PLATE XLIII. 



Page 

 DoRYCRixus MissTssiFPiENSis F. Roem€r 455 



Fig. 1. Specimen with anus and stem. (Coll. Lisbon A. Cox.) 



DoEYCRixus GouLDi (Hall) 456 



2. Large specinjen with arms and stem. (Coll. W. and Sp.) 



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



AoEOCEiNus spiNosuLus (Hall) 478 



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



DORYCRIXUS CORNIGERUS (Hall) 458 



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



DoETCEiNus MissouEiENsis (Shumard) 4G3 



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



Agaeicoceinus nodulosus Worthen 497 



7a. Dorsal aspect of the calyx. (Same collection.; 

 7h. Ventral aspect of the calyx. 



Agaricocrixus Whitfieldi Hall 496 



S«. Dorsal aspect of the type specimen. (Illinois State collection.) 

 8l>. Ventral aspect of the same specimen. 



Agaricocrixus xodosus Meek and Worthen 493 



9. Calyx and portion of the arms. (Coll. ^V. and Sp.) 



