TRANSACTIONS OF WAGNER 

 016 



TERTIARY FAUNA OF FLORIDA 



ridged, subequilateral ; the beaks low, calyculate ; the dorsal slopes slightly 

 rounded, subequal ; the base evenly arched, not projecting ; hinge well de- 

 veloped, the marginal grooves in the right valve almost as long as the dorsal 

 margins; pallial sinus small, rounded in front, falling considerably short of 

 the vertical from the beaks. Lon. 3.25, alt. 2.25, diam. 1.5 mm. 



This small form is distinctly flattened, and looks not unlike the flat valve 

 of some Corbulas. Only a few valves were obtained, but all agreed in this 

 character. The sculpture seems to have been not unlike that of E. chipolana. 

 The horizon is younger than the Chipola marl, but carries, with some peculiar 

 forms, a number of Chipola species. 



Ervilia polita n. s. 

 PLATE 33, FIGURE 17. 



Pliocene of the Caloosahatchie and Shell Creek ; Ball and Willcox. 



Shell inequilateral, moderately full, the anterior end shorter, the ends 

 evenly rounded, the base gently curved ; dorsal slopes gentle, dorsal margins 

 nearly straight, the posterior a little depressed ; surface smooth, polished, 

 marked only by feeble incremental lines; hinge normal, delicate; pallial sinus 

 rounded in front, reaching forward of the vertical from the beaks. Lon. 6.25, 

 alt. 3.75, diam. 2.3 mm. 



It is somewhat odd that the Pliocene species, which is very abundant in 

 the Caloosahatchie marl, should be more unlike either of the recent species 

 than the forms here made known from the Oligocene. E. polita appears to 

 be a very well-characterized and distinct species. 



Ervilia oregonensis n. s. 

 PLATE 33, FIGURE 16. 



Eocene (?) of the Nehalem River, Columbia County, Oregon; J. S. 

 Diller. 



Shell small, oval, moderately inflated, smooth and more or less polished ; 

 inequilateral, the beaks low, small, closely adjacent ; the anterior end slightly 

 more acute than the posterior end; interior unknown. Lon. 7.5, alt. 5, diam. 

 3.25 mm. 



Although this shell is detached from hard rock and the interior cannot 

 be examined, I feel no doubt that it is correctly referred to this genus, and 

 have included it here to complete the list of our fossil species. 



