Bulletin 34 38 



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

 drich's collection. 



Genus LEDA Schumacher 

 acuta Conrad 



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

 1 83 1. (Not of Sowerby, 1837). 



Leda cuneata Sowerb}^ P. Z. S., p. 198, 1832. 



Nucula acuta Conrad, Fos. Medial Tertiar}^ p. 57, pi. 30, 

 fig. 2, 1845 ; Holmes, Post-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. 



unca 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 Maryland, 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 widely distrib- 

 uted, varies greatly 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- 

 13^ 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, 



