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TERTIARY FAUNA OF FLORIDA 7/ 



is synonymous. A small species of Tellina of almost identical form is figured 

 by de Gregorio under this name (pi. 35, figs. 13-16) and Cossmann has sup- 

 posed that this might have been Lea's species. Lea's specimens, however, 

 are of the Abra, and the Tellina, requiring a new name, might be called T. 

 Cossmanni. Gregorio's figures erroneously represent the pallial line as en- 

 tire. Conrad's second figure of his tellinula in Harris's reprint (pi. 19, fig. 

 12) is different from his original figure and is either very bad or represents 

 some other shell. 



A. nitens is the only Eocene species yet made known from the eastern 

 United States. From the Oligocene of Vicksburg, Mississippi, Conrad has 

 described A. perovata and A. protexta. Two others referred by him to the 

 same genus are probably referable to Semele (A. mississippiensis and A. 

 staininea Conrad) ; both are Vicksburgian. The following species is derived 

 from the Upper Oligocene : 



Abra triangulate, n. sp. 

 PLATE 49, FIGURE 4. 



Oligocene marl of Bowden, Jamaica; Henderson and Simpson (rare). 



Shell small, thin, polished, subtrigonal, nearly equilateral, wider than 

 high, moderately inflated ; beaks pointed, not much elevated, the dorsal mar- 

 gins straight, diverging at the umbo in an angle of somewhat over ninety 

 degrees; base arcuate; anterior end slightly longer, rounded; posterior end 

 shorter, more pointed ; exterior polished ; anterior dorsal margin in the 

 right valve with a lateral tooth at some distance from the hinge-plate ; on 

 the posterior margin is a short fold not elevated to become a tooth ; the left 

 valve shows no laterals. Alt. 5.5, lat. 6.25, diam. 3.0 mm. 



This species is not unlike A. lioica Dall, of the recent fauna, but of a more 

 evenly trigonal outline and with the anterior part less produced. 



Abra eubreflexa Conrad. 



Amphidesma subrcflexa Conrad, Journ. Acad. Nat. Sci. Phila., vii., p. 133, 1834; Fos. 



Med. Tert., p. 37, pi. 19 (ist ed.), fig. 6, 1845. 

 Abra subrefiexa Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 574, 1863. 



Miocene of the York River, Virginia, Conrad and Harris; Petersburg, 

 Virginia, Burns. 



This is an elongated species, with feeble lateral teeth. 



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