292 DRYBLEUS, SOUTH AMERICAN. 



by white lines, generally few in number, on the base. Spire long- 

 conic, rather acute ; whorls 7, a little convex, the last about three- 

 sevenths the total alt., rounded at base ; columella rather straight- 

 ened. Aperture a little oblique, truncate-oval ; peristome simple, 

 unexpanded, the right margin regularly arcuate, columellar margin 

 dilated above, reflexed. Alt. 31, diam. 15 ; alt. of aperture 15 mill. 



On the Ma i' anon River, northern Pent. 



Bulimus mexieanus LAM., An, s. Vert., vi, p. 123 (1822). VAL- 

 ENCIENNES, Rec. Obs. Zool., etc., ii, p. 247, pi. 56, f. 1 (1833). DEL- 

 ESSERT, Rec. de Coquilles, pi. 27, f. 9 (1841). Not Bulimus mexi- 

 eanus Reeve, 1848 ; cf. Crosse & Fischer, Moll. Terr. Mex., i, p. 541, 

 and v. Martens, Biol. Centr. Amer. Moll., p. 251. Helix (Coehlo- 

 gena) vittata Humboldt, FER., Tabl. Syst., p, 54, no. 397 (no descrip- 

 tion). 



Bulimus humboldtii REEVE, Couch. Icon., pi. 58, f. 391 (Jan., 

 1849). PFR., Monogr., iii, p. 415; iv,482; vi, 128 ; viii, 165. 



? " Bulimus (Mes em br inns') pceeilus d'Orb. ?' LUBOMIRSKI, P. Z. 

 S., 1879, p. 725 (numerous color varieties described, from Chota, 

 Peru). 



It has long been recognized that the original B. mexieanus of 

 Lamarck (figured in Delessert's folio), is not a Mexican shell, but 

 identical with B. hwnboldtii of Reeve, the B. mexieanus of the lat- 

 ter author being a totally different thing. 



The typical form of mexieanus has three dark basal girdles inter- 

 rupted by fine white lines. Whether B. primularis deserves varie- 

 tal recognition or not I do not know, having seen no specimens. 



Var. primularis Reeve. (PL 49, figs. 59, 60). 



Shell perforate, ovate-turrited, rather thin, nearly smooth ; yel- 

 lowish-white, ornamented with two wide black bands below the 

 middle and one interrupted median and another basal band of 

 chestnut. Spire long-conic, rather acute. Whorls 7, a little con- 

 vex, the last about three-sevenths the length, rotund at base ; col- 

 umella rather straightened. Aperture little oblique, truncate-oval ; 

 peristome simple, unexpanded, the right margin regularly arcuate, 

 columellar margin dilated above, vaultingly reflexed. Alt. 29, diam. 

 14; alt. of aperture 13 mill. (Pfr.). 



Chaehapoyas, Peru (Lobb) ; Uteubamba River, north-eastern Peru 

 (Stiibel). 



