74 Bulletin 34 106 



'45 ; Tuomey and Holmes, Pleio. Fos. C, p. 85, pi. 21, f. 

 12, 1857 ; Dall, Tr. W. I., 3, p. 1198, pi. 42, f. 3, 1900 ; p. 

 1298, 1903. 



paphia I^amarck, An. s. Vert., 5, p. 608, 1818, (as Venus); 

 Hilgard, Rept. Chief Engineers to Sec. War, p. 358, 1870. 

 Not of Linnaeus, Sj'st. Nat., ed. 12, p. 1129, 1767. 



alveata Say, Am. Conch. 7, pi. 63, 1833. Not of Conrad, 

 1831. 



varicosa Sowerby, Thes. Conch. 2, p. 723, pi. 155, f. 67, 

 1853 ; Dall, Bull. 37, U. S. N. M., p. 54, '89, (as Venus). 



athleta Conrad, 1864. (as Circumphalus) . 

 Note. — The type locality of Conrad's V. latilirata was the 

 Miocene of Calvert Cliffs, Maryland. Conrad laid stress 

 upon the irregularit}" of the ribs (one being usually very 

 wide), of the Miocene specimens, and we have noticed 

 this peculiarity strongly in specimens from great depths in 

 the deep wells. It cannot, however, be taken as an invari- 

 able characteristic, for the regularly ribbed type, which is 

 rather more characteristic of the Recent, occurs also in 

 the Miocene. 

 Distribution. — Hatteras to Rio Grande do Sul, Brazil, 10-124 

 fms. Miocene to Recent. Gulf coast. — Recent : West 

 Fla. ; Cameron, La., Galveston. Pleistocene : New Or- 

 leans artesian well of 1856 at 480 feet, Lake Borgne bor- 

 ings, New Orleans Gj^mnasium well at 1200 feet. Plio- 

 cene : Caloosahatchie marl, Fla. Pleistocene to Upper 

 Miocene (?): Knapp's No. i well, Terrebonne Parish, at 

 2000-2150, -2250-2450, 2443 feet. 

 (Lirophora) ulocyma Dall, MS. in coll., U. S. N. M. ; Harris, 

 Bull. Am. Pal., i. No. 3, p. 91, 1895 ; Dall, Tr. W. I. S., 

 3, p. 1296, pi. 42, f. 5, '03. 

 Distribution. — Miocene of Alum Bluff (upper bed), Calhoun 

 Co., Fla., and south of Tallahassee, (Vaughan) and of the 

 Galveston well at 2236-2650 feet (Harris). 

 (Timoclea) grus Holmes, Post-Pl. Fos. S. C, p. 37, pi. 7, f. 5, 

 185S, (as Tapes); Dall, Tr. W. I. S., 3, p. 1299, 1903. 



parva Sowerby, Thes. Conch., 2, p. 787, pi. 168, f. 227, 



