112 OXYSTYLA, MEXICO, ETC. 



b. Varices few, gray ; apex and peristome white ; no bands ; 

 surface plicatulate lencochilns, p. 129 



b 1 . Varices few, blackish, the peristome also dark. 



tri -I iii-lii. p. 120 



b" 1 . Varices numerous, several on the last whorl, and blackish 

 like the peristome; bands 0-2. melanocheiluf, p. 122 



a 1 . Shell rather thin, with longitudinal stripes in addition to vari- 

 ceal streaks. 



b. Varices few, narrow, 1 or 2 on the whole shell. 



c. Last whorl without spiral hands ; Stripes 2- or 3-forked 

 above, widening into broad blotches above the peri- 

 phery ; last whorl large. princeps, p. 113 



zonifera, p. 123 



c 1 . Similarly blotched, but with 2 obscure bands below ; 



form more slender and acuminate. Ureas, p. 118 



c 2 . Last whorl with thrice angulated narrow continuous 



stripe-, crossei, p. 11G 



frifrarfd, p. 11.") nliilciniii. p. 129 



c s . Last whorl with a peripheral band of oblong blackish, 

 alternating with bull' spots; mottled ; 2 narrow hands 

 on spire ; shell large, \\ ith long, straight columella. 



decejttor, p. 116 



c 4 . Last whorl with simple, rarely forked or xigxag brown 



stripes, cro.-.-ed by three spiral bands. fcnmxin-i, p. 119 



c 5 . Last whorl with a light /.one below the suture and 



another around the base, the wide intervening belt 



darker, with \\ider .-tripes. zonifera. p. 123 



c 6 . Shell large, with close, pale violaceous nearly straight. 



stripe-, and few varices. Uriiln. p. I '_' I 



//. Yariees 1-1, narrow, a perceptibly paler /one on the 



elo-ely streaked >hell In-low the suture. mifera, p. 1-.'! 



. Shell solid and strong with longitudinal stripe- or -put-, and 



varices. 



b' 2 . Variees rather wide, the lip very broadly dark-bordered 

 in-ide ; -hell luiiri/ anil thick, boldly striped abo\e. <jeiier- 

 ally lieeoniing nrh reddi-h-brown on the la.-t whorl. 



pontli'i-oxa, p. 1 30 



/>'. N'ariee- n-nallv -1 to fi, wide and prominent ; lip generally 

 rather broadly dark-bordered ; usually a white -nbsutnral 

 band ; shell solid. 



