123 MOLI,USCA OF THE GULF OF MEXICO 



91 



nexilis Gould, Otia Conch., p. 238, 1862 ; Dall, Proc. U. S. 



N. M., 6, p. 338, 1883. 

 lata (Adams) Bush, Trans. Conn. Acad., 6, pt. 2, j). 476, 

 1885. Lapsus penyis. There is no S. lata Adams. 



Distribution. — Hatteras to Brazil, moderate depths. Pliocene 

 to Recent. Gulf coast. — Recent : Cedar Keys {nexilis 

 Dall, '83), St. Joseph's Bay, West Fla., also 30 fms. off 

 shore ; Horn Island, Miss. ; Mobile Point, Ala. (ty])e lo- 

 cality). Pleistocene : New Orleans pumping station No. 

 7. Pliocene : Caloosahatchie, Fla. 

 (Semelina) nuouloides Conrad, Am. Jour. Sci., 41, p. 347, 1841 ; 

 Fos. Med. Tert., p. 73, pi. 41, f. 6, 1845, (as Amphides- 

 ina); Pr. A. N. S., Phila., p. 574, 1863, {a^s Abra); Dall, 

 Bull. 37, U. S. N.M., p. 60, '89 ; Tr. W. I. S., 3, p. 994, 

 1900; Dall and »Simpson, Bull. U. S. Fish Com., i, p. 

 477, 1901. Not Syndosmya yiuculoides Whitfield, Mio. N. 

 J., 1894, =^Sportella sp. (Dall). 



Distribution. — Hatteras to the Antilles, 2-124 f^^s. Miocene 

 (Oak Grove, Fla. ; var. striatula Dall ; N. C. and Va.) to 

 Recent. Gulf coast. — Recent : Tampa and Pensacola, 

 Fla. Pleistocene : Gymnasium club well at 1200 feet, 

 New Orleans. Pliocene : Caloosahatchie beds, Fla. 



Note. — Comparison of specimens from the Gymnasium well 

 shows close agreement with specimens of nuculoides from 

 the Miocene of Curry, N. Car. Shell having the anter- 

 ior end long, posterior short, sinus enormous. 



Genus CUMINGIA vSowerby 

 tellinoides Conrad, Jour. Acad. Nat. Sci. Phila., 6, p. 25S, pi. 11, 

 f. 2, 3, 1831 ; Amer. Marine Conch., pi. 14, f. 2, 1831, 

 {diS Mactra); Holmes, Post-Pl. Fos. S. C, p. 53, pi. 8, f. 

 12 '60 : Gould, Inv. Mass., Binney's ed., p. 79, f. 390, 

 '70; Dall, Bull. 37, U. S. N. M., p. 62, pi. 56, f. 14. 

 '89 ; Singley, 4th Ann. Rept. Texas, p. 329, 1892 ; 

 Mitchell, List Tex. Sh. : Dall, Tr. Wagner Inst. Sci., 

 3, p. 1000, 1900; Clark, Md. Geol. vSurv., Pleistocene, p. 



