ODONTOSTOMUS. 79 



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

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

 base, the fourth and fifth small, within the right margin. Peristome 

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

 lamellif'orm, compressed callus, right margin shortly subarcuate 

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

 Zool.) 



Length 16^, diam. 4, length of aperture 4, width 3| mill. 



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



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



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

 brown, irregularly streakedly spotted with whitish striae, spire long- 

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

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

 4J-5, aperture with peristome 4^ mill, long, 3^ wide (Doer.). 



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

 de la Reduccion. 



0. maculosus DOER., Bol. Acad. Cienc. Cord., p. 455 (1875); 

 Periodico Zool. i, pt. 3, p. 186 (1875). B. maculosus Doer., KOB., 

 Xachrbl. 1876, p. 7. PFR., Monogr. viii, p. 611. 



Similar to 0. profundidens 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 striae. 



O. OLAINENSIS 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 i*eflexed. {Doer., Per. 

 Zool.) 



