132 BULIvKTlN 4 246 



Explanation of Plate 3. 



(13) 



Page. 

 Fig. I. Ostrea crenulimarginata Gabb 45, 159. 



(Type specimen). 



2. Perna cornelliana n. sp 48, 162. 



3. Perna cornelliana n. sp 48, 162. 



4. Modiola saffordi Gabb 49, 163. 



5. Modiola saffordi Gabb; from Texas; young 49, 163. 



6. Modiola szibpontis n. sp 49, 163. 



Cast of left valve, X2. 

 a. Fragment of exterior imprint, showing markings. 



7. Lithodomus gainesensis n. sp 50, 164. 



Cast of left valve, X2. 

 a. Cast of right valve, X2. 



8. Area sp 50, 164. 



From a gutta-percha mould, X2. 



9. Area, same species as fig. 8. 



From a gutta-percha mould, 

 a. Cast of interior of fig. 9. 



ID. Ciicullcea macrodonta Whitfield 51, 165. 



Exterior of left valve, 

 a. Exterior of right valve. 



II. Cucullcsa saffordi Gabb 51, 165. 



(Copy of Gabb's figure). 



