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TERTIARY FAUNA OF FLORIDA 



Shell like Lavicardiuin but with the anterior half finely radially striate, 

 over which pass sharp, elevated, oblique lamellations ; posterior half with 

 sharp, elevated, radial ribs. 



Genus SEBRIPBS Beck. 



Serripes (Beck MS.) Gould, Inv. Mass., p. 93, 1841; C. gronlandicum Gmelin. 

 Aphrodite Lea, Trans. Am. Phil. Soc., v., p. in, 1834; obs. genus Unio, i., p. 223; sole 



ex. A, columba Lea, op. cit.; not Aphrodite Hiibner, 1816 (Lepidoptera). 

 Acardo Swainson. Mai., p. 374, 1840 ; C. edcntuluin auct. ; not Acardo Bruguiere, or 



Lamarck, 1799, or Oken, 1815. 



Valves smooth mesially, radially striate towards the ends, cardinal teeth 

 obsolete ; pallial line truncate behind ; foot geniculate, compressed, serrate on 

 the edge below. 



This genus is confined to boreal seas and includes only two species in the 

 present fauna. 



Genus CORCTJLUM Bolten. 

 Corculum Bolten, Mus. Boltenianum, p. 188, 1798; ed. ii., p. 131, 1819. Cardium cardissa 



L. Roemer, Conch. Cab., 2d ed. (Cardium), p. 113, 1869. 

 Cardissa Megerle von Muhlfeldt, Entw., p. 52, No. 19, 1811; Swainson, Mai., p. 373, 1840; 



Gray, Ann. Mag. N. Hist., 1853, p. 41 (not of Oken, Lehrb. d. Naturg., pp. viii., 232, 



234, 1815, = V enericardia Lam.). 



Isocardia Oken, Lehrb. d. Naturg., pp. viii., 234, 1815 (not of Lamarck, 1799). 

 < Hemicardes Cuvier, Regne An., ii., p. 479, 1817. 



Hemicardium Ferussac, Fabl. Syst., p. xliii., 1822; Gistel, Naturg., p. 172, 1848. 

 Hcinicardia Morch, Yoldi Cat., ii., p. 36, 1853; H. and A. Adams, Gen. Rec. Moll., ii., p. 



458, 1857. 



Shell antero-posteriorly compressed, mesially keeled, closed, with a moder- 

 ately impressed escutcheon but no lunule, feeble radial sculpture and normal 

 hinge. In adults of the larger forms of this genus the umbones pass by each 

 other like the blades of a pair of scissors and the ligament is very short. 



Genus LTJNTJLICARDIA Gray. 

 Lunulicardia Gray, Ann. Mag. N. Hist., 1853, p. 41 (C. retusum L.) ; H. and A. Adams, 



Gen. Rec. Moll., ii., p. 459, 1857; Roemer, Conch. Cab., 2d ed. (Cardium), p. 116, 



1869 ; not Lunulicardium Miinster, 1840. 

 Opisocardium Bayle, Journ. de Conchyl., xxvii., p. 35, 1879. 



Shell truncate in front with a deeply impressed lunule, but no escutcheon, 

 the flap of the dorsal anterior margin projecting into the cavity of the lunule, 

 hinge pressed out of shape by the lunular depression but otherwise normal ; 

 sculpture feeble. 



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