PLATE XXVI. 



PA UK 



Fig. 1. Cyathocrinus? sangamonensis, M. and W 310 



1 a. View of anal or posterior side of the body, without the arms. 



1 b. View of under side of same. 



Fig. 2. Zeacrinus? crassus, M. and W 314 



2 a. Posterior view of body to the top of second radial pieces. 



2 b. View of under side of same. 



Fig. 3. Zeacrinus discus, M. and W 312 



3 a. Under side of body. 



3 b. Posterior side of same to the top of first radials. 



Fig. 4. Productus nanus, M. and W 320 



4 a. Ventral view. 

 4 b. View of front. 

 4 c. Lateral view. 



4 d. Enlargement of costae on front. 



Fig. 5. Aviculopecten pellucidus, M. and W 327 



5 a. Left valve. 



5 b. Enlarged surface markings. 



Fig. 6. Aviculopecten Coxanus, M. and W 326 



6 a. Left valve. 



6 b. Enlarged surface markings of same. 



Fig. 7. Aviculopecten interlineatus. M. and W 329 



1 a. View of left valve. 



6 b. Surface markings, enlarged. 



Fig. 8. Aviculopecten Koninckii, M. and W 328 



8 a. View of right valve. (Costae slightly too large and too distant, in the 



engraving.) 



Fig. 9. Myalina recurvirostris, M. and W 344 



9 a. View of outside of left valve, showing the imbricating lamellae of growth. 

 9 6. Inside of same, showing the muscular impression, cardinal area, etc. 



9 c. Anterior view of the two valves united, showing their slightly differ- 

 ent convexity, small byssal opening, unequal beaks, etc. 



Fig. 9*. Streblopteria tenuilineatus, M. and W 334 



9 a. Right valve. 



9 b. Enlargement of the very fine striae. 



Fig. 10. SOLENOMYA RADIATA, M. and W 349 



10 a. Dorsal view. 



10 b. Side view of partly exfoliated specimen. 



• The figures here alluded to are on the left lower corner of the plate. By an oversight, in changing 

 figures from oue plate to another, two species were numbered nine on this plate. 



