TRANSACTIONS OF WAGNER 

 830 



TERTIARY FAUNA OF FLORIDA 



This species is characterized by the swollen and rounded anterior end, 

 without pedal truncation, and the attenuated posterior end, with the dorsal 

 margin more or less reflected. It is a smaller shell and less equilateral than 

 the Pliocene form confused with it by Heilprin. The distinctions he mentions 

 between it and the original rcflexa, as figured by Say, are inconstant, and if 

 the number of specimens had been as large as that at my disposal, doubtless 

 he never would have separated them. The P. Mcnardi of Deshayes is related 

 to P. Goldfussii, and much less so to this species. Stunted specimens of P. 

 rcflexa are often quite broad and very puzzling. The depth of the pallial 

 sinus differs quite markedly between individuals, and also its width, the shorter 

 specimens, as usual, having the wider sinus. 



Panopea americana Conrad. 

 P. americana Conr. , Fos. Medial Tert., p. 4, pi. 2, fig. i, 1838. 



Miocene of Calvert Cliffs, and very abundantly at Jones's wharf, also on 

 the Patuxent and St. Mary's River, Maryland, and at Coggins Point, Vir- 

 ginia. 



This fine species is the American analogue of the European P. glycymcris 

 Born (1780), from which it differs by its smaller and. heavier shell and deeper 

 and narrower pallial sinus. It is immediately recognizable by its pedal trun- 

 cation and oblique posterior margin. The European shell is more generally 

 known by the later name of P. Aldrovandi Menard, 1807. 



Panopea generosa Gould. 



P. generosa Gould, Proc. B. Soc. Nat. Hist., iii., p. 215, 1850; Moll. Wilkes Expl. Exp., 



p. 385, pi. 34, fig. 507. 

 Glycimeris generosa Carpenter, Suppl. Rep. Brit. Assoc., 1863, p. 637 ; Cooper, Cat. Cal. 



Fos., 7th Ann. Rep. State Mineralogist, California, p. 241, 1888. 



Miocene of Contra Costa and Santa Barbara Counties, California ; Plio- 

 cene of Santa Barbara and San Fernando, California; Pleistocene of Santa 

 Barbara and San Pedro, California, Cooper; recent from Puget Sound south 

 to the Gulf of California, Gould, Stearns, and Palmer. 



This fine species is widespread and variable. Gabb unites to it the Myu 

 (= Panopea) abrnpta of Conrad (Wilkes Expl. Exp., Gcol., p. 723, pi. 17, fig. 

 5, 1849) an d the Glycimeris cstrcllana Conrad (Pac. R. R. Reps., vii., p. 194, 

 P'- 7. fig- s - 5. 5 a j '857). After a comparison of the figures and specimens I 

 conclude that Conrad's two species are identical, and as Deshayes used the 



