MUSEUM OF COMPARATIVE ZOOLOGY. 279 



This species is more oblique and inequilateral, more rostrated and quad- 

 rangular, than A. ceqiuilis Say, as figured and described by bim. It does not 

 gape behind, as that is said to do, nor is its palUal sinus as irreg ul a r as in 

 A. (equalis, but it is more ovate and does not rise as high ; the teeth also appear 

 to be stouter and wider in A. lioica. It has been obtained at many stations of 

 the Fish Commission off the Carolinas, and even to the New England coast. 

 It does not seem to live in more than 180 fms.; all found at greater depths 

 were dead valves. 



Genus ERVILIA Tcrton. 



Ervilia nitens Montagu. 



One valve of tbis common West Indian shell was dredged in 7 to 50 fms., at 

 Station 287, near Barbados. 



Genus CUMINGIA Soweebt. 



Cumingia tellinoides Conrad. 



Cumingia tellinoides Conrad, Journ. Phil. Acad. Nat. Sci., VI. p. 258, pi. ix. figs. 2, 3, 



1830. 

 Lavignon Petitiana D'Orbigny, Moll. Cuba, II. p. 236, pi. xxv. figs. 33-35, 1846. 

 Lavignon antillarum D'Orbigny, 1. c, p. 236, pi. xxv. figs. 36-38, 18-16. 



Habitat. Station 10, in 37 fms., Gulf of Mexico, living. 



The species is variable in form. The artist has reversed one of D'Orbigny's 

 figures, so that his two figures look more unlike than they would otherwise. 

 It is a connnon shell on the coast of the United States in comparatively shoal 

 water, and from its nestling habit is generally deformed. 



Genus SEMELE Schumacher. 



Semele obliqua Wood. 



Tellina obliqua Wood, Gen. Conch., t. 41, figs. 1-2, 1815. 



Amphidesma variegata Lamarck, An. s. Vert., lere ed., V. p. 490, 1818. 



One valve dredged by the "Bache," May 13, 1872, in 63 fms. S.W. of Gar- 

 den Key. 



Semele cancellata D'Orbigny. 

 Amphidesma cancellata D'Orbigny, Moll. Cuba, IL p. 241, pi. xxv. figs. 42-44, 1846. 



Valves were obtained in 30 fms. west of Florida. It is not rare un the 

 shores of South Florida and the Antilles. 



