FAUNA OP ORTHAULAX PUGNAX ZONE. 133 



CARDITA (CARDITAMERA) TEGEA Dall. 

 Plate 17, fig. 1. 



Cardita (Carditamcra) recta Dall, Trans. Wagner Inst., vol. 3, pL 1, p. 189, 



pi. 11, fig. 4, 1890 ; not of Conrad, 1868. 

 Cardita {Carditamera) tegea Dall, Trans. Wagner Inst., vol. 3. pt. 6, p. 



1412, 1903. 



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

 of the lower bed at Alum Bluff, Chattahoochee Eiver; and of the 

 Chipola marls near the count}^ bridge, Chipola Kiver, Calhoun 

 County, Florida; Shepard, Burns, and Dall. U. S. Nat. Mus. No. 

 165194. 



The figure is taken from a pseudomorph which was formed after 

 a specimen perhaps somewhat worn before fossilization. The fresher 

 specimens from Calhoun County are less smooth. 



CARDITA SHEPARDI, new species. 

 Plate 21. figs. 10. 12. 



Shell small, inflated, solid, subquadrate; beaks moderately ele- 

 vated, situated in the anterior third of the shell; sculpture of (on the 

 left valve about 21) elevated rounded ribs with deep, equal, or wider 

 channeled interspaces; the ribs are ornamented with numerous promi- 

 nent nodules rather sparsely distributed and on the posterior slope 

 becoming more prominent and imbricated; anterior end rounded 

 posterior subtruncate; base medially compressed; hinge as usual in 

 the genus, rather delicate ; inner margins of the valves crenulated by 

 the sculpture. Length 9.75, height 6, diameter 6 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. Post 

 collection, U. S. Nat. Mus. No. 165193. 



This little species is closely related to the recent C. domingensis of 

 the West Indies. 



Family CYRENIDAE. 



Genus CYRENA Lamarck. 



Cyrena (part) Lamarck, Anim. s. Vert., vol. 5, p. 551 his, 1818. — Bowdich, 

 Elem. Conch., vol. 2, p. 9, 1822.— Anton, Verz. Conch., p. 13, 1839. 



Cyrena Sowerby, Gen. Shells, fasc. 5, 1822. — Swainson, Malac, p. 370, fig. 

 119c, 1840.— Dall, Trans. Wagner Inst., vol. 3. pt. G, p. 1441. 1903. 

 Type, Cyrena hengalensis Lamarck. 



Section FOLYMESODA Raflnesciue. 



Polymesoda Rafinesqite, Ann G^n. Sci. Phys. Bmxelles, 1820. p. 319. 

 Type, Cyclas caroliniana Bosc=Cyrena carolinensis Hanley. — Morch, 

 Malak. Blatt., vol. 7, p. 193, 1861; Jonrn. de Conchyl., vol. 9, p. 348. 

 1861.— PiLSBRY, Nautilus, vol. 15, p. 48, 1901.— Dall, Trans. Wagner 

 Inst., vol. 3, pt. 6, p. 1442, 1903. 



