PLATE XLII. 



Page 



Agaeicoceinus americanus (Bremer) 488 



Fig. 1. Specimen with arms, from Indiana. 



2a. Posterior side of the calyx (specimen from Tennessee). 

 25. Anterior side of another specimen (from the same locality). 



Agakicoceinus Whitfieldi Hall , 496 



3. Ventral aspect of the calyx. (Illinois State collection.) 



Agaeicoceinus ameeicanus, var. tubeeosus (Hall) 489 



4. Dorsal aspect of the calyx. 



Doeyceinus coenigeeus (Hall) 458 



5. Specimen with arms and stem. 



6. Postero-lateral view of calyx. 



Doeycbinus quixquelobus Hall 460 



7. Side view of the calyx ; the spines broken away. 



8. Lateral view of a specimen with arms. 



9. Posterior side of calyx ; the spines intact. 



Doetceinus subtuebinatus Meek and Worthen 466 



10a. Antero-lateral view of the calyx. 

 105. Posterior view of the calyx. 



Aokoceinus Cassedayi (Lyon) 483 



11a. Ventral aspect of the type specimen. (Lyon collection.) 



115. Posterior side of the same. 



12. Side view of a specimen from Alpena, Mich. 



Aoeoceinus concavus ( Meek and Worthen) 482 



13a. Dorsal aspect of the type specimen. (Mus. Comp. Zool.) 

 135. Ventral aspect of the same. 

 13c. Side view of same. 



Allopeosalloceinus conious Lyon and Cass 407 



14a. Anterior view of the calyx. 

 145. Posterior view of the same. 

 14c. Dorsal aspect of same. 



(All specimens in the collection of Wachsmuth and Springer, unless otherwise stated.) 



