TRANSACTIONS OF WAGNER 

 1440 



TERTIARY FAUNA OF FLORIDA 



in the left valve, the anterior continuous with a short anterior lateral ; right 

 valve with two cardinals, a short socket for the left anterior lateral, a long 

 socket for the long cross-striated posterior lateral of the left valve; ligament 

 external ; pallial line hardly flexuous ; inner margins of the valves minutely 

 crenulated. 



This is Anomala Cossmann, 1886, not of Hiibner, 1816. The specimens 

 I have examined, obtained from M. Cossmann, have the lateral teeth smooth, 

 but it is possible that in older specimens they may be striated, as the manuals 

 assert. All these fossil forms need rigorous scrutiny, as it is quite possible 

 that the characters of the hinge, where the distal cardinals in the adult are 

 liable to become obsolete, may have been misinterpreted. In the light of 

 Bernard's researches it is possible to recognize the equivalent of a tooth which 

 earlier would have attracted no attention. The present type, if adult, would 

 seem to be rather closely allied to Loxoptychodon. 



Genus Ditypodon Sandberger, 1875. Type Cyrena Suessii C. Mayer. Lower 

 Pliocene of Italy. 



Valves oval, the anterior end shorter ; one stout cardinal in each valve ; 

 laterals smooth, the anterior short and stout, the posterior longer; the pallial 

 line obtusely sinuous. 



Genus Donacopsis Sandberger, 1872. Type Cyrena acutangularis Deshayes. 

 Eocene 



Valves donaciform, compressed, the posterior end shorter, the disk some- 

 times feebly radiated internally with a slightly crenulated margin ; hinge with 

 three small cardinals in each valve, the posterior left one obsolete, the anterior 

 right one very feeble ; the laterals feebly striated, the anterior much longer 

 than the posterior ; pallial line with a short, wide, triangular sinus.* 



Genus Villorita Gray, 1833. 

 Genus Batissa Gray, 1853. 

 Genus Egeria Roissy, 1805. 



While closely related, it seems more convenient to place Spharium and 

 Corneocyclas (=Pisidium Pfeiffer) in a separate family. 



The normal number of cardinal teeth for the Cyrenida is three in each 



* This diagnosis is drawn from specimens kindly furnished by M. Cossmann, and is 

 corrected from those previously published. 



