143 



MOLLUSCA OF THE GULF OF MEXICO 



III 



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

 subgenus Spengleria, Try on. 



Genus PHOLAS Linnaeus 

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

 Hanley, Descr. Cat. Rec. Sh., p. 6, pi. 9, f. 44. l8 4 2 5 

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

 of Rep. Ex. Doc. 1, pt. 2, p. 887, '78 ; Dall, Bull. 37, 

 U. S. N. M., 72, 1889 ; Tr. W. I. S., 3, p. 815, '98. 

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

 Holmes, Post-Pi. 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, \& pro duct a 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-Pi. Fos. S. C, 

 p. 58, pi. 9, f. 1, 1 a, '6o ; Gould, Inv. Mass., Binney's 

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

 1, 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- 

 i3°o, 1330-1375 feet. 



