88 DKYM-KTS, MEXICO AND CENTHAI. AMERICA. 



cimens are comparatively rare. An unusually large specimen long. 

 28, diam. 14, apert. 11 mill. found at Pan/os (Cbnrotft), has been 

 sent to me by Prof. Hausknect of Weimar ; its bands are very dark, 

 nearly black, the shell thus approaching (). nigro-fasciatus Pfr., from 

 Colombia [vol. xi, p. 307, pi. 50, figs. 98, 99], but differs from it in 

 the distinct spiral striation and the comparatively narrower hand?-." 



Var. JUQUILEXSIS Martens (fig. 40). Bands narrower. Length 19^, 

 diam. 9-10 mill. 



S. Mexico: Juqin'/a, in the State of Oaxaca (Boucard) ; Oaxaca 

 (Uhde). N. Guatemala: Vera Paz (Salvin). 



llnliiinis virgnlatits TKISTRAM, P. Z. S., 1863, p. 412 #/////////. 

 alternans var. /^, PFH., Monogr. Helic. Vivent. vi, p. 131. ///////////- 

 Ins (Liostracus) alternant, var. P, FlSCH. & CROSSE, Miss. Scient. 

 Me\., Mollusca i, p. 501, pi. 23, fig. 5a. Otostotnus (Liostracus) 

 alternans VON MART. Conch. Mittheil. ii, p. 192. BuUntiihis (Lios- 

 tracns) mexicanus, var., v<>\ MART., in Malak. Bliitt. xii, p. 24 

 (1865) (ex parte). 



D. TRICINGULATUS (Anton). 



Shell oval-conic, spire nearly steeple-shaped, acute ; 7 rather Hat 

 whorls with deep suture, the last whorl two-fifths the whole length : 

 translucent, shining, smooth ; light yellow with three dark-brown 

 bands on the last whorl, and two light brown ones on the others ; 

 perforate; aperture oval-oblong. Alt. 1 inch 1 line, diam. (> lines. 

 (Anlon.*) Snlinjn lux. (Anton). 



/////////MS tricingulatus ANT., Verzeich. der Conch. Sammlung 

 II. K. Anton, p. 43, no. I'tOG (1839) PFR., Monogr. ii, p. 212. 



More lengthened than rexilhnn (lirod.). the last whorl more obr~r. 

 somewhat shorter, and, then-fore, more conic-oblong. Besides the 

 groiind-eolor, the slim form and delicate peri-tome al-o distinguish it 

 troin trlfaxciatus Brug. (Anttnt.) 



Has not been recogui/ed by later authors. The locality is evi- 

 dently Taboga island, in the I>ay of Panama. 



D. IKINIH RA8AN1 9 ( PfeiH'er). PI. ].", |ig. 11. 



Sliell ojienly perforate, ovate-eonie, smooth, shining; yellowi.-h- 

 white, ornamented with three bands and an umbilical area of rose- 

 brown. Spire conic, acute, whorls d, a trifle convex, the last a little 

 shorter than the spire ; odiimella Straightened, vertical, the aperture 



