132 MOLLU.SCA OF THE GULF OF MEXICO I02 



unduSosum de Folin, Ann. Soc. Linn. Maine et Loire, ii, 1869: 

 Ball, Bull. 37, U. S. N. M., p. 142, '89. 



Distribution. — Charlotte Harbor, West Fla. to Jamaica. 

 Pliocene to Recent. 



niiidiim Stimpson, Pr. Bost. Soc. N. H., 4. p. 112, 1S51, (as 

 Caecum); Tryon, Man.. 8, p. 222, pi. 67, f. 73, '86; Dall, 

 Tr. W. I. S., 3, p. 302, £892; Vanatta, Pr. A. N. S. Phila., 

 55, P- 758, 1903. 



Distribution. — West Florida, at Tampa and Crooked Isl. 

 (Calhoun Co. ), to Jamaica. 



Genus BIVOf^lA Gray 



exerta Dall, Bull. M. C. Z., Harvard Coll., 9, p. 39, 188 1; 18, 

 p. 264, pi. 26, f. 6, '89; Bull. 37, U. S. N. M., p. 144. pl- 26, 

 f. 6, '89. 



Distribution. — Cape Lookout, N. C, to Barbados. Gulf of 

 Mexico, West Florida and Texas regions, deep water. 31- 

 1002 fms. 



Genus VERHI SGULARIA Lamarck 



spirata Philippi,Arch. fur Naturg. 2, pt. i, 224, pi. 7, f. i, 1836, 

 (as Vermiculus); Tryon, Man., 8, p. 187, pi. 55, f. 99, 100, 

 '86; Dall, Bull. 37, U. S. N. M., p. 144, pi. 51, f. 4, '89; 

 Tr. W. I. S., 3, p. 304, '92; Singley, 4th Ann. Rept. G. S. 

 Tex., p. 340, '92. Johnson, Occ. Pa. Bost. Soc. N. H., 7, p. 

 123, 1915- 



Distribution. — Massachussetts to the West Indies. Gulf 

 coast: West Florida; Matagorda and Corpus Christi Bays, 

 and Quintana, Tex. Pliocene of Shell Creek, &c, Fla. 



Note. — Moerch described as V. melanosdera (Pr. Zool. Soc, 

 p. 174, 186 1 ) a form from Vera Cruz which Tryon regarded 

 as a variet}^ of spirata, and on the same page of the Proceed- 

 ings Moerch described V. quad^'angularisirom.YuQ.a.t'a.n.This 

 was also regarded by Tryon as a variety of spirata (See 



