ODONTOSTO.MUS. 79 



oval, contracted by 5 teeth: one in the middle of tin- parietal margin, 

 the second angular and twisted, on the columella, third within the 

 base, the fourth and h'fth small, within the right margin. Peristome 

 white, expanded, a little acute, the margins joined by a somewhat 

 lamelliform, compressed callus, right margin shortly subarcuate 

 above, expanded below, columellar margin reflexed. Doer., Per. 

 Zool.) 



Length 1G^, diam. 4, length of aperture 4, width 3 : | mill. 



Length 18^, diam. 5, length of aperture 4^, width 3^ mill. 



Length 20, diam. 5, length of aperture 4|, width 3^ mill. 



Shell cylindric-fusiform, thin, closely rugose-striate ; corneous- 

 brown,, irregularly streakedly spotted with whitish stria?, spire long- 

 turreted, a little obtuse ; whorls 10, a trifle convex, the last whorl 

 one-fourth the total length ; peristome acute. Length 18-20, diam. 

 4^-5, aperture with peristome 44 mill, long, 3^ wide (Doer.}. 



Argentina: Sierra Ghica de Cordova, in the valley of the arroyo 

 de la Reduccion. 



0. maculosHs DOKR., Bol. Acad. Cienc. Cord., p. 455 (1875); 

 Periodico Zool. i, pt. 3, p. 18G (1875). B. maculosus Doer., KOB., 

 Nachrbl. 187G, p. 7. PFH., Monogr. viii, p. Gil. 



Similar to 0. profundideiis in form, but larger, the striation less 

 sharp, the color much darker corneous-brown or chestnut, with a 

 few oblong, interrupted and irregularly spaced spots composed each 

 of 2 to 5 fine stria?. 



O. OLAINEXSIS Doering. 



Shell rimate, fusiform-turreted, corneous-whitish, silky, slightly 

 diaphanous, very minutely striate ; spire obtuse ; whorls 9, a little 

 convex, the first nearly smooth, the rest closely and very minutely 

 striate, the stria? -flattened ; last whorl one-fourth the total length, 

 two-crested at the base, the side depressed and deeply pitted. 

 Aperture irregular, pentagonal, narrowed at the base, obstructed by 

 5 teeth: a slender, compressed one on the parietal wall, the second 

 compressed and twisted, on the columella, third on the base; fourth 

 twisted, and fifth usually dilated transversely, within the outer lip. 

 Peristome nearly simple, a little acute, the margins joined by a thin 

 callus, right margin strongly arched above, lower margin slightly 

 expanded, the columellar margin narrowly reflexed. (Doer., Per. 

 Zool.) 



