143 MoLLrscA of the Gulf of Mexico hi 



Distribution.— West Florida to St. Thomas, W. I. Type of 

 subgenus Spen^Ieria, Try on. 



Genus PHOLAS Linnseus 

 (Thovana) campechiensis Gmelin, Syst. Nat., 6, p. 3216, 1792; 

 Hanley, Descr. Cat. Rec. Sb., p. 6, pi. 9, f. 44. 1842 : 

 Tryon, Proc. A. N. S. Phila., p. 76, 1862; Hilgard, House 

 of Rep. Ex. Doc. I, pt. 2, p. 887, '78 ; Dall, Bull. 37, 

 U. S. N. M., 72, 18S9 ; Tr. W. I. S., 3, p. 815, '98- 

 oblongata Say, Jour. Acad. Nat. Sci. Phila., 2, p. 320, 1822; 

 Holmes, Post-Pl. Fos. S. C, p. 58, pi. 9. f. 2, '60. Not 

 of Tuomey and Holmes, Pleio. Fos. S. C, p. 103, pi. 24, 

 f. 5, 1857 which, is produda Conrad. 

 candeana d'Orbigny, Moll. Cuba, p. 215, pi. 25, f. 18-19, 

 1845. 

 Distribution. — Hatteras to Brazil. Pleistocene to Recent. 

 Gulf coast. — West Fla. and Texas. 



Genus BARNEA (Leach) Risso 

 COStata Linnaeus, Syst. Nat., ed. X, p. 669, 1758 ; Lamarck, An. 

 s. Vert., 5, p. 445, 1818 ; Holmes, Post-Pl. Fos. S. C, 

 p. 58, pi. 9, f. I, \ a, '60 ; Gould, Inv. Mass., Binney's 

 ed., p. 36, f. 363, '70 ; Hilgard, House of Rep. Ex. Doc. 

 I, pt. 2, p. 887, '78 ; Dall, Bull. 37, U. S. N. M., p. 72, 

 pi. 68, f. 9, 1889 ; Singley, 4th Ann. Rept. Tex., p. 331, 

 '92 ; Dall, Tr. W. I. S., p. 816, '98 ; Clark, Maryland 

 Geol. Surv. , p. 192, pi. 52, 1906. 

 virginianus Lister, Hist. Conch., ed. II, pi. 5, f. 434, 1770. 

 Distribution. — Massachusetts to Brazil. Pliocene to Recent. 

 Gulf coast.— Recent : Indian Pass (Calhoun Co.), Fla.; 

 Point au Fer, Cameron, Chandeleurs, La. ; Galveston, 

 Corpus Christi, Matagorda Bay, Tex. Pleistocene : 

 Grand Chenier, New Orleans artesian well of 1856, at 41, 

 66, 235, 546 feet ; New Orleans pumping station No. 7, 

 Lake Borgne borings; Knapp's wells, Terrebonne Parish, 

 No. 2 at 1434-1519, 1519-1542, No. 3 at 570-700, 1200- 

 1300, 1330-1375 feet. 



