124 OXYSTYI.A, MKXIt <>, KTC. 



ceps, so tliat the young could scarcely be 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 O. jirinceps. 



<>. iiolnlis (Rolle). 



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

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

 tical, margin vertical, only slightly arcuate belmv. Alt. .V.>, diam. 

 29, alt. of aperture 28, width 1C mill. Holds the same relation to 

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



Coli/tin, u'estern Mexico. 

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



Completely typical ft. -.onifera also occurs at Colima, according to 

 Rolle. 



O. I.IVIDA (von Martens). PI. 19, figs. 18, 19. 



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

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

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

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

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

 hardly half the length of the shell, <>val, acute above, milky-purple 

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

 pandexl, 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 : CrJ, ;!(!, .'54 mill. 



W. Mi'.ilm : Mtiztttltin (Melchers). (\'nlrnl Mi.rico: Prrt,,cc of 

 rsjwitillii at tin' }'i>lciin de. Jorullo (type locality; I'hde). 

 is :t'f>ru var., MKNKK, in Xeitsehr. t'iir Malak. vii, p. 1(13 

 ) I'M;, in Martini & Chemnitx, Syst. Conch. Cab., ed. 2, 

 iiii us, p. .'!77, pi. 22, f. 12. Orl/iti/i'riis /irii/nx v. MAKT. in 

 Mcnat-l.. Aka.l. \Vi>s. r.erlin, ISC,. 1 !, j,. ,')42 ; Malak. Hliitt. xii, p. 57 



( ISC,.') ) Pi K. Monngr. Ilelic. \'i\ ent. vi, p. !>9 Fiscn. \ ( 'I;.SSE, 



Mi--. Seient. Mex., Mollusca i, p. -14^. S'i 1:1.111:1 , Beitr. Mex. Land- 



iiiul Siissw.-Concb. v. j.p. 2 ( .-;il, pi. l, r, w, pi. -I, f. r, (an<l i?), pi. 



11, f. I.s. Orlnlirliiis /ir/f/ns v. M A IJTKNS, Hiol. Centr. Amer. pp. 

 180, IMC, pi. lo, f. 11, n (i.s'.t:;). 



