FAUNA OF ORTHAULAX PUGNAX ZONE. 147 



Chipola marl, near the county bridge, Chipola River, Calhoun 

 County, Florida. U. S. Nat. Mus. Nos. 166114, 114747. 



This species, though smaller and with more sharply cut sculpture, 

 may be regarded as the precursor of the Miocene C. sayana. 



? CALLOCARDIA NUX, new species. 

 Plate 18, fig. 3. 



Shell small, equivalve, the beaks near the anterior third, moder- 

 ately convex, short-ovate, the surface smooth except for faint in- 

 cremental lines; beaks low, pointed, prosocoelous, a large lanceolate 

 lunule in front of them which is not impressed but circumscribed by 

 a sharply incised line ; there is no escutcheon ; anterior slope roundly 

 descending, ends of the shell evenly rounded, base prominently ar- 

 cuate ; anterior inaccessible. Height of shell 12, length 14, diameter 

 7 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 166115. 



This simple little shell has no pronou^iced characteristics but is 

 distinct from any of the other Veneridae Imown from this or adjacent 



formations. 



Genus ANTIGONA Schumacher. 



Cytherea Bolten, (part) Mus. Bolteniannm, ed. 1, p. 177, 1798; ed. 2, p. 



124, 1819. Venus inierpera Linnaeus. Not Cytherea Fabricius {Dip- 



tera) 1795, Lamarck, 1806, nor H. and A. Adams, 1856. 

 Dosina Gray, Analyst, vol. 8, p. 308, 1838; Proc. Zool. Soc. London, for 



1847, p. 183. Venus verrucosa Linnaeus. 

 Clausina Bkown, 111. Conch. Gt. Brit., expl. pi. 19, 20, 1827 ; ed. 2, 1844, pp. 



90, 91. V. verrucosa Linnaeus. 

 Omphaloclathrum Morch, Yoldi Cat., vol. 2, p. 25, 1853. 

 Venus SwAiNsoN, Mai., p. 372, fig. 119c, 1840. V. verrucosa Linnaeus, not 



of Lamarck, 1799. 

 Callista Fischer. Man. de Conchyl., p. 1084, 1887, V. verrucosa Linnaeus, 



not Callista Morch, 1853. 

 Cytherea Dall, Proc. U. S. Nat. Mus., vol. 26, No. 1312, p. 354, 1902; 



Trans. Wagner Inst., vol. 3, pt. 6, p. 1271, 1903. Type, Venus puerpera 



Linnaeus. 



ANTIGONA TARQUINIA Dall. 



Plate 26, figs. 1, 2. 



Venus magnifica Heilprin, Trans. Wagner Inst, vol. 1, p. 116, 1886 ; not of 



Sowerby, 1853. 

 Venus tarquinia Dall, Trans. Wagner Inst., vol. 3, pt. 5, p. 1194, pi. 38, 

 figs. 2, 2a, 1900. 

 Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay, 

 Florida (Willcox and Dall), and of Santo Domingo (Gabb). U. S. 

 Nat. Mus. No. 109233. 



