TRANSACTIONS OF WAGNER 

 12 34 



TERTIARY FAUNA OF FLORIDA 



eastern Tertiaries of the United States is the Eocene D. mercenaroidea Aldrich 

 ( Journ. Cinn. Soc. N. Hist, 1887, p. 82 ; and in Harris, Bull. Pal., ii., p. 172, 

 pi. i., figs. 10, ica, 1897). This shell has the aspect of a Meretrix, and I doubt 

 its pertinence to the genus Dosinia. 



C. Lateral teeth and lunule absent. 



Genus CYCLJNA Deshayes. 



Cyclina Deshayes, Traite Elem., i., expl. pi. xiv., bis, figs. 20-22, 1849; Cat. Conch, Brit. 



Mus., i., pp. 3, 30, 1853; Venus sinensis Gmelin (syn. excl.) ; not Cyclinus Kirby, 



Coleoptera, 1837. 

 Cyclina Morch, Cat. Yoldi, ii., p. 29, 1853; Romer, Krit. Unters., p. 16, 1857; Mon. 



Dosinia, p. 4, 1862; H. and A. Adams, Gen. Rec. Moll., ii., p. 432, 1857; Stoliczka, 



Cret. Pel. India, p. 157, 1871 ; Tryon, Str. and Syst. Conch., iii., p. 180, 1884 ; Fischer, 



Man. de Conchyl., p. 1082, 1887. 



The soft parts in this genus agree with those of Dosinia according to 

 Adams. 



The dental formula is L - 0101010 -. The fourth, or posterior, right cardinal 



R. loioioi. 



is nearly obsolete ; the one in front of it and the anterior left cardinal are bifid. 

 The shell is suborbicular, nearly equilateral, and plump ; the ligament uncovered 

 but deepset; there is neither a defined lunule or escutcheon, the sculpture is 

 faint and chiefly concentric, feebly reticulated by radial striae; the hinge-plate 

 is broad, the inner margins of the valves crenulate, the pallial sinus moderate 

 in size, acutely angular in front, and obliquely ascending. There is no trace of 

 lateral teeth; the periostracum is polished and translucent, the coloration 

 tinted, without a distinct pattern. The typical forms are denizens of China, 

 Japan, and Korea. The two American forms which have been referred to this 

 genus by Deshayes are discussed under the head of Cyclinella and are probably 

 allied to Mysia. They differ conchologically by having smooth inner margins 

 to the valves, a defined lunule, no trace of the fourth right cardinal tooth, and 



purely concentric sculpture. 



. 



Genus CLEMENTIA Gray. 



dementia Gray, Syn. Brit. Mus., p. 74, 1842; P. Z. S., 1847, p. 184; Pfeiffer, Mai. Blatt., 

 xiv., p. 144, 1868, and xvi., p. 190, 1870; H. and A. Adams, Gen. Rec. Moll., ii., p. 

 433. J 857; Stoliczka, Cret. Pel. India, p. 157, 1871; Tryon, Str. and Syst. Conch., iii., 

 p. 181, 1884 ; Fischer, Man. de Conchyl., p. 1084, 1887 ; Venus papyracea Gray. ; 



Blainvillia Hupe, Rev. de Zool., 1854, p. 219; not Blainvillia Desvoidy, 1830. Diptera. 



