1890.] NATURAL SCIENCES OF PHILADELPHIA. 181 



Fig. 5. Capulus cornuformis (Winchell). Lateral view of a small 

 individual. [Coll. J. S. Newberry.] 



Fig. 6. Calyx of Plah/crliius pileiformis Hall showing the impres- 

 sion made by a calyptrsean shell on the posterior side of the 

 crinoid. 



Fig. 7. Portion of the ventral surface of AS^ro/om/t?(s re^ra/is (Hall) 

 showing the impression made by a growing shell of Capu- 

 lus. 



Fig. 8. Capulus formosus Hejes. Lateral view of type specimen, 

 attached to Dorycrinus immaturus W. & Sp. [Coll. Wachs- 

 muth and Springer.] 



Fig. 9. Capulus quincyensis (McC.) View of an exfoliated speci- 

 men. 



Fig. 10. Capulus infu7idibulvm (M. &W.) A shell attached to the 

 anal surface of Platycrinus hemisphericus M. &. W. 



Fig. 11. Capulus equilateralis (HalY). An example adhering to the 

 calyx of Platycrinus hemisphericus M. & W. [Coll. 

 Wachsmuth and Springer.] 



Fig. 12. Capulus sulcatinus Keyes. 12a. View of the type speci- 

 men. 12b. Ventral view of another individual. 



Fig. 13. Capulus chesterens is (JSl. &V^^.) 13a, View from above of 

 a specimen resting on the ventral surface of Pterotocrimis 

 acutus Weth. 13b. Another example with the alate radial 

 dome plates of the crinoid broken away. [Both from Collec- 

 tion of Wachsmuth and Springer.] 13c, 13d. Lateral 

 aspects of two other individuals. 



Fig. 14. Cajndus parvus Swallow. 14a, 14b. Views of the type 

 specimen [Museum State University of Missouri]. 14c. 

 A larger example generally known as C. nebrascensis 

 (Meek). 

 [Unless otherwise stated all specimens here figured are in the col- 

 lection of C. R. Keyes.] 



