TRANSACTIONS OF WAGNER 

 1078 



TERTIARY FAUNA OF FLORIDA 



Genus AVICTJLARITJM Gray. 



Avicularium Gray, Ann. Mag. N. Hist., xi., p. 41, 1853. Type Cardium avicularc Lam. 

 Lithocardium Woodward, Man. Rec. and Fossil Shells, p. 291, 1854. 



Shell keeled laterally, subtrigonal, the hinge-line long, straight, mostly in 

 front of the umbones, and the hinge produced anteriorly. 



Section Avicularium s. s. 

 Valves closed. 



Section Byssocardium Munier Chalmas, 1882. 



Valves with a byssal foramen on the anterior margin. Type Cardium 

 emarginatum Deshayes. 



Pterocardia (Agassiz) Bayan, 1874, founded on C. striatitin Buvignier, 

 Mem. Soc. phil. de Verdun, ii., p. 5, pi. 3, figs. 20-21, 1843 (C. Burignicri 

 Deshayes), I have not seen, but from Fischer's description it must be allied 

 to Avicularium if not identical. 



Goniocardium Vasseur, Journ. de Conchyl., xxviii., p. 182, 1880, has not 

 been well figured and is founded on G. Heberti Vasseur and Cardium rhachitis 

 of Deshayes. Cossmann refers it to Fragum, but from the description given 

 by Vasseur it would seem to resemble Avicularium. 



Genus PROTOCARDIA Beyrich. 



Protocardia Beyrich, Zeitschr. fur Malak., p. 17, 1845. Type Cardium liillanum Sowerby. 

 Cretaceous. 



Protocardium Meek and Hayden, Proc. Acad. Nat. Sci. Phila., xii., p. 418, 1860; Coss- 

 mann, Cat. Illustr., p. 163, 1887. 



Nemocardium Meek, Pal. Upper Missouri, p. 172, 1876; C. semiaspcrum Deshayes. 



Shell globose with a posterior area sharply distinguished by sculpture from 

 the rest of the surface ; closed ; hinge normal, with no lunule or escutcheon. 



Section Protocardia s.s. 



Posterior area sculptured with smooth radial ribs, the remainder of the 

 surface with concentric striation. 



Section Nemocardium Meek. 



The posterior area spinose or tuberculate, the remainder of the surface 

 finely radially striate, or finely reticulate ; the anterior laterals springing from 

 the umbonal cavity. 



