i68 



MOLLUSCA OF THE GULF OF MEXICO 



138 



CLASS AMPHINEURA 

 ORDER POLYPLACOPHORA 

 Genus LEPIDOPLEURUS Risso 



pergranatus Dall, Bull. M. C. Z., 18, p. 414, '89, (as Leptochi- 

 ton); Bull. 37, U. S. N. M., p. 172, '89; Dall and Simpson, 

 Bull. U. S. Fish Com., i, p. 451, pi. 58, f. i, a-c, 1901. 



Distribution. — Gulf of Mexico, western Florida region, 

 Porto Rico and Dominica, 114-1181 fms. 



Genus CHAETO PLEURA Shuttleworth 



apiculata Say, Amer. Conch., app., pt. 7, 1830, (as Chiton')\ 

 Dall, Bull. 37, U. S. N. M., p. 172, pi. 51, f. 10, T889; 

 Pilsbry, Man., 14, p. 35, pi. 13, f. 75-79, 1892; Johnson, 

 Occ. Pa. Bost. Soc. N. H., 7, p. 8, 1915. 



Distribution. — Massachussetts to Haiti, Gulf coast, various 

 localities of northwestern Florida and Chandeleurs, I^a. 0-30 

 fms. 



Genus ISCHNOCHSTON Gray 



limaciformis Sowerby, Proc. Zool. Soc, p. 26, '32, (as Chiton)-, 

 Dall, Bull. M. C. Z., 18, p. 415, '89; Pilsbry, Man., 14, p. 

 57, pi. 16, f. 9-16, '92; Dall and Simpson, Bull. U. S. Fish 

 Com., I, p. 452, 1901. 



Distribution. — Gulf of Mexico, southeastern part, Lat. 24° 

 N., Lon. 83° W., at 37 fms. Also Key West and the An- 

 tilles, Central America and Peru. Under stones at low 

 water. 



purpurascens C. B. Adams, Proc. Bost. Soc. Nat. Hist., p. 9, 

 1845, (as Chiton)', Dall, Bull. 37, U. S. N. M., p. 172, '89; 

 Pilsbry, Man., 14, p. 58, pi. 17, f. 23, 24, 1892; Dall and 

 Simpson, Bull. U. S. Fish Com., i, p. 452, 1901. 



Distribution. — Texas region of the Gulf of Mexico, Florida 

 Keys. Jamaica and Porto Rico. 



