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TERTIARY FAUNA OF FLORIDA 



has three cardinals in each valve, the posterior in one valve more or less fused 

 with a series of obliquely transverse rugosities carved in the inner and ventral 

 mass of the nymphs which interlock between the two valves. There appear to 

 be two groups or subgenera as follows : 



Subgenus Cytheriopsis Conrad.* Type Cytherea hydana Conrad (+ Grate- 

 lupia moulinsi Lea). 



Valves trigonal, the left posterior cardinal fused with the nymphal rugosities, 

 the pallial sinus short and rounded in front. Eocene of Alabama. 



Subgenus Grateloupia s. s. Type Donax irregularis Basterot (-f- Grateloupia 

 donaciformis Desm. ) . 



Valves elongate oval, the posterior right cardinal fused with the nymphal 

 rugosities, the pallial sinus long and acute, reaching to the vertical of the 

 anterior lateral lamina. Miocene of Bordeaux and Vienna. / 



Q-rateloupia (Cytheriopsis) hydana Conrad. 

 Cytherea hydana Conrad, Fos. Tert. Form., No. 3, p. 36, Aug., 1833; Harris's reprint, 



pi. xx., fig. 3, 1893. 



Gratelupia moulinsi Lea, Contr. Geol., p. 59, pi. ii., fig. 33, Dec., 1833. 

 Cytheriopsis hydana Conrad, Am. Journ. Conch., i., pp. 7, 146, 1865; iii., p. 14, 1867. 

 Meretrix Dalli Cossmann, Notes Compl., p. 10, pi. i., figs. 9, 10, 1894 ; very young shell. 



Claiborne sands, Claiborne, Alabama. 



Several authors have, with some reason, refused to adopt Conrad's name, 

 though it is six weeks earlier than Lea's, on the ground that his diagnosis, 

 without a figure, was insufficient to identify the species, while Lea gave an 

 excellent diagnosis and figure. However, it is quite certain that the two are 

 identical, and I have therefore used the older name. 



Grateloupia (Cytheriopsis) alumensis n. sp. 



PLATE 52, FIGURE 14. 



Oligocene of the Chipola horizon at Alum Bluff, Florida; Burns. 

 Shell smooth or faintly concentrically striated, subequilateral, trigonal, mod- 

 erately thick, base somewhat produced in the middle ; beaks pointed, low, sub- 

 central ; lunule impressed, bounded by a very delicate incised line, lanceolate ; 



* If this name should be regarded as too close to Cytheropsis McCoy, of earlier date, 

 Grateloupina might be substituted. 



