28 BULIvETlN 34 60 



piirpuratus Conrad, Amer. Marine Conch., p. jo, pi. 2, f. 



I, 1 83 1. Not of Lamarck. 



dislocatus Holmes, Post-Plio. Fos. S. C, p. 12, pi. 2, f. 12, 

 1858 ; Hilgard, House of Rep., Ex. Doc. 1, pt. 2, p. 888, 

 1878. 



irradians var. dislocatus Dall, Bull. 37, U. S. Nat. Mus., p. 

 34, 1889 ; Singley, Fourth Ann. Rept. Texas Geol. Surv , 

 324, 1892. 



gibbiis var. dislocatus Dall, Trans. Wagner Inst. vSci., 3, pt. 

 4, p. 746, 1898 ; Idem, pt. 6, p. 1615, 1903. 

 Remarks : I^innseus' description of O. gibba was based on the 

 drawing of a Jamaican Pecten by Browne (Civil and Nat. 



Hist. Jamaica, p. 41, pi. 40, fig. 10, 1756J. According to 



Dr. Dall, this is identical with dislocatus Sa^^ 

 Distribution. — Hatteras to Brazil and west coast of Africa. 

 Miocene to Recent. Gulf coast. — Recent : Cedar Keys, 

 Fla ; Matagorda, Corpus Christi, Texas. Pleistocene : 

 Orient and ^orth Creek, Fla. ; New Orleans well of 1856 

 at 235, 480, 546 feet ; Lake Borgne borings (?); Knapp's 

 wells, Terrebonne Parish No. i at 2000-2150, 2250-2450, 

 No. 3 at 570-700, 1150-1200, 1200-1300, 1330-1375, 1400-1440, 

 1443-1470. 1500-1525 feet. 

 (Plagioctenium) gibbus irradians Lamarck 



Pecteii irradians Lamarck, An. s. Vert., 6, p. 173, 1819. 



co?icentric7is Say, Jour. Acad. Nat. Sci. Phila., p. 259, 1822. 



ir radiatis Oould, Binney's Ed. Invert. Mass., p. 199, fig. 496, 

 1870 ; Dall, Bull. 37, U. S. Nat. Mus., p. 34, pi. 53, fig. 



II, 1889 ; Singley, Fourth Ann. Rept., Geol. Surv. Texas, 

 p. 324, 1892. 



gibbus vox. irradians Dall, Trans. Wagner Inst. Sci., v^ol. 3, 

 pt. 4, p. 748, 1898 ; Vanatta, Proc. Acad. Nat. Sci. Phila., 

 vol. 55, p. 756, 1903. 

 Distribution. — New Jersey to Texas. Pleistocene to Recent. 

 Gulf coast. — Recent : Tampa, Florida ; Horn Island 

 Miss. ; Chandeleurs, La. ; Corpus Christi, Galveston 

 Texas. Pleistocene : North Creek, Manatee Co., Fla. ; 



