75 MOLLUSCA OF THE GULF OF MEXICO 43 



13, p. 41, I9I5- 



Distribution. — Norway- and Maine to Gulf of Mexico, where it 

 was dredged by U. S. Fish Com. at 1467 fms. 

 jeffreysi Dall, B. M. C. Z., 9, p. in, '81, (as Necerd)\ Idem, 12 

 p. 295, pi. 3, f. 2, '86 ; Bull. 37, p. 66, pi. 3, f. 2, '89. 

 Distribution.— Fla. Straits to St. Vincent, 193-687 fms. Gulf 

 of Mexico, Cape San Antonio and Yucatan Strait, 

 arcuata Dall, B. M. C. Z., 9, p. 113, '81, (as Necera)\ Idem, 12, 

 p. 296, pi. 3, f. 3, 4, '86 ; Bull. 37, pi. 3, f. 3, 4, '89. 

 Distribution. — Yucatan Strait, 640 fms. Doubtful species 

 founded on a toothless left valve, 

 rostrata Spengler. SeeG. O. Sars, p. 89, t. 6, f. ya, 5, (as Necera); 

 Dall, Bull. 37, p. 66, '89. 

 Distribution. — Arctic Ocean to Barbados, 65-1639 fms. West 

 Fla. region. (Dall J). 

 (Cardiomya) costel'ata Deshayes 



Corbula costellata Desh., Expl. Sci. Morea, Geol., p. 86, pi. 

 7, f. 1-3, 1837. 



Sphena costellata d'Orbigny, Moll. Cuba, 2, p. 286, 1846 ; 



Atlas, pi. 27, f. 17-20, 1845. 

 Cardiomya costellata Dall, B. M. C. Z., 12, p. 297, '86 ; Bull, 



37, p. 66, '89. 



Distribution. — Hatteras to St, Thomas, 2-205 f ms - Gulf coast, 



Marco, Fla., shallow water. 

 (Cardiomya) perrostrata Dall, B. M. C. Z., 9, p. 10, '81, (as 



Necera); Idem, 12, p. 296, pi. 2, f. 3 a-b, '86; Bull. 37, 



p. 66, pi. 2, f. 3 a-b, '89 ; Johnson, Occ. Papers, Bost. 



Soc. Nat. Hist., 7, No. 13, p. 42, 19x5. 

 Distribution. — Martha's Vineyard, Mass. ; Gulf of Mexico, off 



the Tortugas, and South to Grenada, 84-416 fms. 



Genus MYONERA Dall and Smith 



iamelHfera Dall, B. M. C. Z., 9, p. 113, '81, (as Necera) ; Idem > 

 12, p. 304, pi. 3, f. 7, '86 ; Bull. 37, p. 68, pi. 3, f.7,'89. 

 Distribution. — Florida to Jamaica, 84-250 fms. Gulf of Mex- 

 ico, off Cedar Keys. All species recent, abyssal. 



