TRANSACTIONS OF WAGNER 



TERTIARY FAUNA OF FLORIDA 



with the nymph. The merest trace of a similar tooth sometimes occurs in C. 

 cancellata. 



Section Timoclea Brown. Type Venus ovata Pennant. 



Sculpture predominantly radial, the concentric element feeble ; the middle 

 left and two posterior right cardinals grooved ; the escutcheon smooth. The 

 siphons are united to their orifices in this group. 



Section Clausinella Gray. Type Venus fasciata Da Costa. 



Sculpture of broad concentric waves and fine concentric striae, radial sculp- 

 ture obsolete; the concentric waves not pinched out behind; the ligament 

 covered by the margin of the valves when closed. The siphons are short and 

 partly united. 



Section Lirophora Conrad. Type Venus athleta Conrad ; a recent 

 species is V. paphia Linne. 



Sculpture of broad concentric waves, attenuated and often conspicuously 

 lamellose distally ; radially striate ; ligament not covered by the valve mar- 

 gins ; the edges of the right nymph and of the left posterior cardinal with 

 interlocking rugosities. 



?Section Volupia Def ranee, 1829.* Type V. rugosa Def ranee. Eocene 

 of Hauteville. 



Shell small, sculpture resembling that of Lirophora, but with the lunule 

 and a posterior area large, defined by a deep sulcus, dividing the disk into 

 three areas which are crossed by a few thick, swollen, adjacent concentric 

 ribs; beaks high, curved as in Isocardia; hinge-teeth three, of which one is 

 bifid, received into pit-like sockets ; pallial line entire. 



In placing this shell here I have followed Fischer, as above cited, not 

 having been able to obtain specimens or definite information as to its char- 

 acters. The figures given by Def ranee and copied by Bronn are so obscure, 

 and the diagnoses so far from clear or complete, that it will require a reexami- 

 nation of the fossil to enable its proper place in the system to be determined. 

 I should from the wretched lithograph given in the Dictionnaire suspect the 

 shell to be Lucinoid and belong somewhere near Here Gabb, but this is mere 



* Volupia Defrance, Diet. Sci. Nat., Iviii., p. 451, atlas, fossiles, pi. xcvii., fig. i, 1829; 

 Deshayes, Enc. Meth., iii., p. 1134, 1832; Bronn, Lethaea Geogn., p. 943, pi. xxxviii., fig. 

 12, 1838; Fischer, IwSj^. de Conchyl., p. 1084, 1887. 



V 



