TRANSACTIONS OF WAGNER 

 1480 



TERTIARY FAUNA OF FLORIDA 



Pteromeris (sp.) Conrad, Am. Journ. Conch., i., p. 9, 1865; not of Conrad, Proc. Acad. 



Nat. Sci. Phila. for 1862, p. 578, 1863. 

 Micromeris Conrad, Checkl. Eocene Fos. N. Am., p. 5, May, 1866; Proc. Acad. Nat. Sci. 



Phila. for 1872, p. 51. 

 Pteromeris Stoliczka (following Conrad, 1865), Cret. Pelecypoda of India, p. 279, 1871; 



not of Conrad, 1862. 

 Micromeris Tryon, Struct, and Syst. Conch., iii., p. 229, 1884; Fischer, Man. de Con- 



chyl., p. 1018, 1887; O. Meyer, Berichte Senckenb. Ges., 1887, p. n; Cossmann, 



Notes Compl., Eoc. Ala., p. 13, 1894. 



The type of this group is the following species : 



Crassatellites (Micromeris) minutissimus Lea. 

 Astarte minutissima Lea, Contr. Geol., p. 64, pi. ii., fig. 39, 1833. 



This little species is so minute that a study of its hinge involves some diffi- 

 culty. Under an ordinary magnifier it appears to have two arcuate cardinals 

 in each valve. Thorough study under a compound microscope shows that a 

 very feeble right anterior and left posterior cardinal tooth is also present in 

 well-developed and preserved specimens, the former frequently hardly visible. 

 The resilium is occasionally preserved in closed pairs of this fossil, which is 

 quite a help in making out the hinge. The anterior end of the shell is more 

 produced and has the longer slope of the two dorsal margins. Meyer's M. 

 senex does not appear to differ appreciably from a very young Venericardia. 

 The species is also reported from the Jacksonian. Cardita atomus Deshayes, 

 of the Parisian Eocene, was compared with this species by Conrad, but it seems 

 to have the hinge of Pleuromeris. 



The Astarte minor of Lea, which was included in Micromeris by Conrad, 

 is a typical Crassinella and, of course, entirely distinct from Lea's Astarte 

 parva, with which Conrad and others have sometimes united it. 



Subgenus CUNA Hedley. 



Cuna Hedley, Memoirs of the Australian Museum, iv., part v., p. 314, July, 1902. Type 

 C. concentrica Hedley, op. cit., p. 315, fig. 55. 



Crassatellites (Cuna) parvus Lea. 

 Astarte parva Lea, Contr. Geol., p. 63, pi. ii., fig. 37, 1833. 

 Micromeris parva Conrad, Checkl. Eocene Fos. N. Am., p. 5, 1866; Stoliczka, Cret. 



Pelecypoda of India, p. 279, 1871 ; Cossmann, Notes Compl. Eoc. Ala., p. 13, 1894. 

 Astarte (Micromeris) parva Gregorio, Mon. Claib., p. 200, pi. xxvii., figs. 20, 31, 32, 33, 



1890. 



