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TERTIARY FAUNA OF FLORIDA "^"^ 



Anisodonta (Basterotia) bowdeniana n. sp. 



Oligocene of the Bowden beds, Jamaica ; Henderson. 



A species of Basterotia, which appears to be clearly distinct from B. -quad- 

 rata Hinds, is represented by a broken right valve in the collection made by 

 Henderson and Simpson at Bowden. Hardly complete enough to figure, it 

 may be described as distinguished from B. quadrata by the following char- 

 acters. The keel, which is so prominent a feature in B. quadrata, in the present 

 shell is well marked only on the beak, rapidly becoming obsolete distally and 

 represented only by a rounded ridge, which passes imperceptibly into the 

 general convexity of the valve. The beaks in B. bozvdeniana are less angular 

 and elevated, the shell thinner and more ovate, the hinge-line longer, the ele- 

 vated tooth smaller in proportion to the shell and much more delicate. The 

 surface is minutely sagrinate, the length 10.5, the diameter about five milli- 

 metres. 



Anisodonta (Fulcrella) (elliptica R6cluz? var. ) Carolina Dall. 

 Plate 45, Figure 20. 

 Eucharis elliptica Recluz, Journ. de Conchyl., i., p. 168, 1850. 

 Mya simplex Holmes, Post-Pl. Fos. S. Car., p. 55, pi. 8, fig. 16, 1858. 



Miocene of Duplin County, North Carolina, at the Natural Well and 

 Magnolia, Burns ; Pleistocene of Simmons Bluff, South Carolina, Holmes ; 

 living in eighteen to twenty-two fathoms off the coast of North Carolina, United 

 States Fish Commission. 



I am somewhat in doubt as to the distinctness of the Miocene shells from 

 A. elliptica Recluz, characteristic specimens of which are found associated 

 with those, which I have named A. corbuloides, off the coast of North Caro- 

 lina. Holmes's figure is very like the recent A. elliptica, and a little larger and 

 more rounded behind than the Miocene fossils. These differences, however, 

 appear to correspond to the differences between young and adult A. elliptica. 

 Two right valves of the Miocene form were collected, and more profuse 

 material is needed before their position with regard to A. elliptica can be 

 ascertained. Should they prove distinct the Miocene species will require a 

 new name. A. simplex will at any rate be annexed to A. elliptica as a synonym, 

 Recluz's name having seven or eight years' priority, for the recent and Pleisto- 

 cene form. 



Anisdonta americana n. sp. 



Plate 36, Figure 7. 

 Pliocene marls of the Caloosahatchie, Monroe County, Florida; Dall. 

 Shell small, thin, elongate, subquadrate, the anterior end shorter and. 



