86 Bulletin 9 378 



Explanation of Plate 6. 



(13) 



Page. 

 Fig. I. Ostrea compressirostra SslY , (young) 37, 339 



2. Ostrea sellceformis Q.on'i 41, 333 



3. Ostrea var. sylvcerupis Har. (young). Exterior 



of larger valve 38, 33Q 



3a. The same, lateral view. 



4. O. var. sylvcerupis Har. (young). Showing 



valves in normal position " " - 



5. Ostrea thirsce Gabb. Showing exterior of 



larger valve 40, 333 



. 5a. Interior of the same. 



6. O. thirsce Gabb. Showing interior of lesser 



valve " " 



7. O .alabamiensis Eea. Showing radiate epider- 



mal structure 41, 333 



8. Plicatida filatnentosa Q.on. (var.) " " 



9. P. filamentosa Con . , a larger specimen " " 



10. Anoviia sp 42, 334 



1 1 . Spondyliis " " 



12. Lima ozarkana n. sp 43, 335 



Engraved bj^ the Electro Light Engrav- 

 ing Company, New York. 



