TRANSACTIONS OF WAGNER 

 8l8 



TERTIARY FAUNA F FLORIDA 



Plwlas laiiicUata Russell, Essex Journ., i., p. 50, 1839 (not Turton). 



yjrfica crispata Gray, Ann. Mag. Nat. Hist., 2d Scr., viii., p. 385, 1851. 



Zirphtra crispata (Gray) Leach, Moll. Gt. Brit., p. 252, 1852. 



Tlnirlosia crispata Tryon, Mon. Pholadacea, p. 83, 1862 ; (not in Leach as cited by Tryon !) 



Miocene (?) of New Jersey near the mouth of Shark River, Whitfield (in 

 United States National Museum); Pleistocene of Labrador and boreal eastern 

 America ; recent in northeastern America from the Arctic Seas south to New 

 York and possibly to North Carolina. 



I have been unable to trace the Thurlosia synonyme further than Tryon. 

 It does not occur in the Mollusca of Great Britain, from which he cites it. If 

 Agassiz's reference be correct it would antedate Zirpluea and 'Lirf<ea, but I can- 

 not discover the publication to which he alludes, and therefore retain what 

 appears to be the earliest identifiable name. There is some doubt as to the 

 age of the New Jersey fossil ; at least it has the appearance to me of being 

 newer than the Miocene. 



The Pholas semicostata H. C. Lea, which in 1889 I referred with doubt 

 to Zirf<za, probably belongs with Tcredina. It is a very peculiar form, and 

 the species has not yet been found in a fossil state. The Zirfaa from the 

 northwest coast of America, referred by Carpenter to Z. crispata, is a distinct 

 though allied species, called Z, Gabbii by Tryon, and found fossil in the Pleis- 

 tocene of California as well as living, there and northward. Another species, 

 Z. dentata Gabb (Pal. Cal., ii., p. 18, pi. 3, figs. 31-31 a, 1866), is found in the 

 Californian Pliocerte. Z. plana White (Bull. U. S. Geol. Surv., No. 51, p. 15, 

 pi. iv., fig. 22, 1889) is from the Tejon Eocene near Martinez, California. 



Subfamily JOUANNETIN.ffi Tryon. 



Anterior gape closed in the adult by a calcareous deposit, or " callum," 

 attached to either valve and the edges of which meet in the middle line below ; 

 valves with one or more radial sulci, and with one or more accessory plates. 



Genus PHOLADIDEA Gooilall. 



Pholadidea Goodall, in Turton, Conch. Diet., p. 147, 1819. Type P. Loscoinbiaiia Good- 

 all (= Pholas papyracctts Turton, Dith. lirit., p. 2, 1822, + (?) Pholas papyraceus 

 Solander MS., 1788). 

 Cadinusia Leach, Moll. Gt. Brit., p. 254, 1852 ; same type. 



Shell with a double anterior accessory plate (protoplax), the other plates 

 present or absent, the valves prolonged behind into leathery or testaceous 

 cups or a tube (siphonoplax) for the protection of the siphons. 



