r.68 MOLLUSCA OF THE GuLF OF MEXICO 1 38 



CLASS AMPHINEURA 



ORDER POLYPLACOPHORA 



Genus LEPIDOPLEURUS Risso 



pergranaius Dall, Bull. M. C. Z., i8, p. 414, '89, {-SiS 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, 1889; 

 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, La. 0-30 

 fms. 



Genus ISCHNOCHSTO!^ 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. 



