TRANSACTIONS OF WAGNER 

 632 



TERTIARY FAUNA OF FLORIDA 



Shell Creek, Willcox and Dall ; near Brunswick, Georgia, Couper ; Wacca- 

 maw beds, South Carolina, C. W. Johnson. 



Area limula var. platyura Dall. 



Pliocene of the Caloosahatchie and Alligator Creek ; Willcox and Dall. 



Shell with the posterior end of the cardinal border elevated and forming 

 nearly a right angle with the posterior margin of the valves, thus giving the 

 posterior part of the shell a higher and more angular look, which at first 

 seems very distinct. 



Area limula var. fllosa Conrad. 

 Noetia ponderosa Say, var. N. carolinensis Conr., Proc. Acad. Nat. Sci. Phila. for 1862, 



p. 290 ; not Area carolinensis Wagner, 1847. 



Area carolinensis Heilprin, Proc. Acad. Nat. Sci. Phila. for 1881, p. 450. 

 Noetia filosa Conrad, Kerr's Geol. Rep. N. Car., App. A, p. 20, pi. 4, fig. 3, 1875. 



Miocene of North Carolina: at Sullivan's marl-pit, Green County, North 

 Carolina, eight miles east of Snow Hill ; Burns. 



This variety has more numerous (thirty-five) ribs when adult and a less 

 angular outline than the typical form. 



Area limula is, with little doubt, the progenitor of A. ponderosa Say, 

 from which it differs by a more quadrate outline and more anterior beaks. 

 The sculpture is usually more elegant, but specimens of A. ponderosa occasion- 

 ally turn up which exhibit equally fine reticulation and divarication of the 

 ribs. A variety analogous to platyura is possessed by all the species of 

 Noetia, but is perhaps more conspicuous in A. limula. I have not found this 

 species in any positively Post-Pliocene beds ; in such it is represented by A. 

 ponderosa. 



From A. incite, when adult, A. limula is distinguished by its smaller and 

 shorter cardinal area and usually by its considerably larger si/.e ; the line of 

 teeth is shorter and the teeth are larger and wider, and more horizontally 

 extended at the ends of the series. 



Area (Noetia) incile Say. 



Area incile Say, Journ. Acad. Nat. Sci. Phila., ist Ser., iv., p. 139, pi. 10, fig. 3, 1824. 

 Miocene of Maryland. Conr., Fos. Tert. Form., p. 16, pi. 2, fig. I, 1832; Fos. 

 Medial Tert., p. 56, pi. 29, fig. 5, 1840. James River and Smithfield, Virginia. 

 octiii protexta Conr., Kerr's Geol. Rep. N. Car., App. A, p. 19, pi. 3, fig. 5, 1875. 

 Miocene of North Carolina. 



