124 OXYSTYLA, MEXICO, ETC. 



ceps, so that the young could scarcely le distinguished from that 

 species. 



Von Martens refers the var. crossei to this species ; but, though it 

 occupies an intermediate place, I consider it, from the material seen, 

 and the geographic location, as decidedly nearer 0. princeps. 



0. nobilis (Rolle). 



Differs from 0. zoniferus, which is near it, in the flat whorls, 

 scarcely impressed suture, black apex and lip, columella nearly ver- 

 tical, margin vertical, only slightly arcuate below. Alt. 59, diam. 

 29, alt. of aperture 28, width 16 mill. Holds the same relation to 

 0. zoniferus that 0. elegans does to 0. princeps (Rolle). 



Colima, western Mexico. 

 Orth. nobihs ROLLE, Nachrbl. D. Malak. Ges. 1895, p. 131, no. 16. 



Completely typical 0. zonifera also occurs at Colima, according to 

 Rolle. 



O. LIVIDA (von Martens). PI. 19, figs. 18, 19. 



Shell ovate-conic, rather solid, regularly striated, plicatulate at the 

 sutures, decussated by very fine spiral lines ; dull buff, painted with 

 close, pale violaceous, nearly straight streaks and some brown-black 

 varices. Spire conic, apex with a large purple-black spot, whorls 7, 

 the upper rather flat, the last a little more swollen. Aperture oblique, 

 hardly half the length of the shell, oval, acute above, milky-purple 

 inside ; columella moderately twisted, milk-white ; peristome unex- 

 panded, black-brown, the terminations joined by a broad black-brown 

 callus. Alt. 79, diam. 43, longest axis of aperture 43 mill. (Mart.} 

 Another specimen measures : 62, 36, 34 mill. 



W. Mexico: Mazatlon (Melchers). Central Mexico: Province of 

 MichommH, especially at the Volcan de Jorullo (type locality ; Uhde). 



Bulimus zebra var., MENKE, in Zeitschr. fiir Malak. vii, p. 163 

 (1850) PFR. in Martini & Chemnitz, Syst. Conch. Cab., ed. 2, 

 Bulimus, p. 377, pi. 22, f. \2. Orthalicus lividus v. MART, in 

 Monatsb. Akad. Wiss. Berlin, 1863, p. 542 ; Malak. Blatt. xii, p. 57 



(1865) PFR. Monogr. Helic. Vivent. vi, p. 99 FISCH. & CROSSE, 



Miss. Scient. Mex., Mollusca i, p. 448. STREBEL, Beitr. Mex. Land- 

 und Siissw.-Conch. v, pp. 29-31, pi. 1, f, 8, pi. 4, f. 6 (and 9?), pi. 

 11, f. 18. Ortulichus lividus v. MARTENS, Biol. Centr. Amer. pp. 

 180, 186, pi. 10, f. 11, lla (1893). 



