TRANSACTIONS OF WAGNER 

 708 



TERTIARY FAUNA OF FLORIDA 



Pecten (Chlamys) Parmeleei n. s. 

 Plate 37, FiGURiis 14, 14 a. 



Pliocene of San Diego, California ; Parmelee. 



This species is close to P. Siviftii Bernhardi of Japan (J. de Conchyl., 

 vii., plates i and 2, 1858) but smaller, and differs by the smooth top surface 

 of the ribs, which in P. Szviftii are more or less striated or coarsely threaded, 

 and by the not alternated radial riblets on the right posterior ear ; also, 

 especially, by the profuse coalescent microscopically checkered squamation, 

 which makes a complete external coating to the valve. Alt. 45, lat. 38 mm. 



The Pecten fauna changes almost completely with the Pleistocene, all the 

 species being known as recent and generally of the same climatic groups as 

 those at present living in the most adjacent waters. 



The following species have been noted : 



Pecten (Ohlamys) islandious Miiller. 

 Pecten islandicus MiilL, Prodr. Zool. Danica, p. 248, 1776. 



Pecten cinnabarina Born, 1778, H- P. rubidus Martyn, 1784, + Ostrea deinissa Solander, 

 1797, + Pecten Pea/eii Conrad, 1 831, + P. /^a^r/t-// Philippi, 1844. 

 Bowlder clays of the northwest coast, also living in Bering Sea; Dall. 

 Ribs numerous, subequal, rounded, small, scaly on both valves, with 

 channelled minutely reticulate interspaces. 



Pecten (Chlamys) hericeus Gould. 

 Pecten Aericetis Gould, Proc. Bost. Soc. Nat. Hist., p. 236, 1850. 

 Pecten hastatus Cpr., 1863 ; not of Sowerby, 1S43. 

 ? = Pecten rastellinuin Val., Voy. Venus, pi. 19, fig. 4, 1835. 



Pleistocene of San Diego, California; Hemphill. 



Middle ribs of the fasciculi on the left valve high, spiny, the rest merely 

 scaly. This is entirely distinct from the true P. hastatits Sby., «'ith which 

 Carpenter confused it. The latter is a smaller, quite rare shell, with entirely 

 different sculpture, and has not yet been found in the fossil state. 



I have taken the name of Gould, as the oldest, for the specific designa- 

 tion of a group of forms of which the original hericeus is only a special 

 development, the prevalent and normal form of the species being the follow- 

 ing shell : 



Pecten hericeus var. navarchus Dall. 



Fecten rubidus Hinds, Zool. Sulph. Voy., p, 61, pi. 17, fig. 5, 1844; not P. rubidus 

 Martyn, 1784, 



