75 MOLLUSCA OF THE GuLF OF MEXICO 



13, p. 41, I915. 



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 Necera): 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 N'ecFra); 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. 7«, b, (as Necera); 

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

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

 Fla. region. (Dallj. 



(Cardiomya) costellata 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 fms. 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, Bo.st. 

 Soc. Nat. Hist., 7. No. 13. p. 42, 1915. 

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

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



Genus MYOIMERA Dall and Smith 



lamellifera Dall, B. M. C. Z., 9, p. 113, '81, (as Necera); Idcm^ 

 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. 



