Buivi^KTiN 34 3^ 



bama, at the Oak Grove horizon, 1550- 1556 feet. Al- 

 drich's collection. 



Genus LEDA Schumacher 

 acuta Conrad 



Nucula acuta Con., Amer. Mar. Conch., p. 32, pi. 6, fig. i, 

 1831. (Not of Sowerby, 1837). 



Leda aineata Sowerby, P. Z. S., p. 19S, 1832. 



Niiciila acuta Conrad, Fos. Medial Tertiary, p. 57, pi. 30, 

 fig. 2, 1845 ; Holmes, I^ost-Plio. Fos. S. C.,p. 16, pi. 3, 

 fig. 7, i860. 



Leda jamaicensis Orb., Moll. Cuba, 2, p. 262, pi. 26, 

 figs. 27-29, 1846 ; Dall, Bull. Comp. Zool., vol. 9, p. 124, 

 1881. 



imca Gould, Proc. Boston Soc. Nat. Hist., 8, p. 282, 1862 ; 

 Verrill, Trans. Conn. Acad., vol. 5, p. 572, pi. 58, fig. 

 41, 1882. 



acuta Hilgard, House of Rep. Ex. Doc. i, pt. 2, p. 887, 

 1878 ; Dall, Bull. 37, U. S. Nat. Mus., p. 44, pi. 7, figs. 

 3, 8, pi. 45, fig. 15, pi. 64, fig. 140, 1889 ; Trans. Wag. 

 Inst. Sci., 3, pt. 4, p. 592, 1898; Vanatta, Proc. Acad. 

 Nat. Sci., Phila., vol. 55, p. 756, 1903 ; Clark, Pleisto- 

 cene of Mar3dand, Md. Geol. Surv., p. 209, 1906. 



acuta Dall, Proc. U. S. Nat Mus., vol. 37, p 250, 1910. 

 Remarks. — This species, which is ancient and widel}^ distrib- 

 uted, varies greatl}" in concentric sculpture. Conrad, in 

 the original description, speaks of the concentric striae as 

 prominent and Dall states that in some instances they may 

 even become coarse ribs or waves. Other forms are near- 

 ly smooth. This is generally so with our material from 

 the Gulf border. 

 Distribution. — East coast, Rhode Island to the Antilles in 30 to 

 155 fathoms. West Coast, California to Valparaiso, Chile. 

 Miocene to Recent. 

 Gulf Coast localities. — Recent: Indian Pass, St. Joseph's Bay, 



