IOO 



Bulletin 34 



New Orleans Gymnasium Club well at 1200 feet, Plio- 

 cene : Caloosahatchie beds, Fla. Type of subgenus Mac- 

 trotoma Dall. 



Genus SPISULA Gray 



(Hemimactra) similis Say, Jour. Acad. Nat. Sci Phila., 2, p. 309, 

 1822 ; DeKay, Zool. New York, Mollusca, p. 230 ; 

 Holmes, Post-Pi. Fos. S. C, p. 39, pi. 7, f. 8, i860; 

 Gould, Inv. Mass., Binney's ed., p. 75, '70; Dall, Bull. 

 37, U. S. N. M., p. 62, '89; Nautilus, 8, p. 26, 1894; 

 Mitchell, List Texas Shells, p. 10 ; Single}^ 4th Ann. 

 Rept. Texas, p. 329, '92 ; Vanatta, Proc. A. N. S. Phila., 

 55> P- 757) I 9°3 ', Vaughan, 2d Ann. Rept. Fla., p. 148, 

 1909 ; Johnson, Occ. Papers, Bost. Soc. N. H., 7, p. 76, 

 1 915. Not Mactra similis Gray, 1828. 

 Distribution. — Cape Cod to Antilles. Pliocene to Recent. Gulf 

 coast. — Cedar Keys, Ft. Barranca, Indian Pass, St. Jo- 

 seph's Bay, Crooked Island, Alligator Harbor (Franklin 

 County), Fla. ; Horn Island, Miss. ; Cameron, La. ; 

 Galveston, Corpus Christi and Matagorda Bays, Tex. 

 Pleistocene : New Orleans pumping station No. 7, 

 Grand Chenier, La. ; Orient, West Fla. 



similis variety raveneli Conrad, 1831 ; Coues, Proc. A. N. S. 

 Phila., p. 137, 1871 ; Dall, Nautilus 8, p. 26, 1894; New- 

 comb, MS. in coll., Dall, Tr. W. I. S., 3, p. 901, 1898. 

 Distribution.— Very abundant at Fort Macon, Ga. Gulf coast 

 Ft. Barranca, Fla. ; Galveston, Tex. Pleistocene : Grand 

 Chenier, La. 



Note. — Indeterminable fragments of several species of Mactra 

 and Spisula were found in the Pleistocene of the Zigler 

 Well No. 15, Jennings, La., at 1650-1700 feet; Knapp's 

 No. 2 well, Terrebonne Parish at 1 731- 1739 feet, and in 

 the Miocene of the Jennings Hey wood Oil Syndicate's No. 

 28 well at 1887-1880 feet, 

 quadricentennialis Harris, MS., Fifth Ann. Rept. Tex. Surv. (Un- 

 published); Dall, Proc. U. S. N. M., 17, p, 105, 1894 

 (as Spisula)-, Harris, Bull. Am. Pal., vol. 1, No. 3, p. 11, 



