ODONTOSTOMUS. 89 



gitudinal, brownish-corneous streaks. Spire somewhat swollen, tur- 

 reted, the apex rather acute. Whorls 8, a little convex, the first 

 buff-corneous, obsoletely striate, the rest closely rib-striate, decussated 

 by 3 to 6 impressed, very minute, spiral lines; the last whorl scarcely 

 two-fifths the total length, whitish, compressed at the side and shortly 

 two-crested at the base. Aperture suboval, contracted by 5 teeth : 

 one in the middle of the parietal wall, a horizontal one on the co.lu- 

 mella, a third in the base, the fourth and filth small, within the right 

 margin. Peristome white, expanded, the margins joined by a thin 

 callus, right margin lightly arcuate above, basal expanded, colurnellar 

 margin reflexed (Doer.). 



Length 17, diam. 6, length of aperture 5|, width 4 mill. 



Length 19, diam. 7J, length of aperture 6^, width 4^ mill. 



Length 20, diam. 7J, length of aperture 7, width 4 mill. 



Argentina : northern part of the Province of Cordova, on granitic 

 hills around Tortoral (Dr. Stelzner). 



Odontostomus martensii DOER., t. c., p. 455 (1875); Periodico 

 Zoologico, i, pt. 3, p. 181 (1875). B. martensii Doer., KOB., 

 Nachrbl., 1876, p. 6. PFR., Monogr., viii. p. 610. 



Distinguished by its sculpture, three fine spiral lines crossing the 

 striae. In the Boletin, 1875, Doering gave the following descrip- 

 tion : Shell fusiform, ventricose, ashen-brown, closely costulate- 

 striate, somewhat decussated by minute spiral impressed lines ; 

 variegated with irregular longitudinal spots of brown-corneous at 

 irregular intervals. Spire swollen, turreted, the apex rather acutely 

 tapering ; whorls 8, a little convex, the last one two-fifths the length. 

 Peristome slightly thickeived, the margins joined by a thin callus. 

 Length 19, diam. 7^, aperture 6f mill, long, 4J wide (Doer.). 



O. MULTISPIRATUS Doering. 



Shell rimate, elongate, cylindric turreted, many-whorled, pellucid- 

 corneous or subopaque, irregularly suhstriate, rather smooth. Whorls 

 12 to 13. a trifle convex, slowly increasing, the first a little convex, 

 substriate, the rest somewhat variegated with whitish stria3 grouped 

 in longitudinal streaks ; last whorl but little impressed in front, the 

 base obsoletely two-crested. Aperture ovate, normally contracted by 

 5 teeth ; peristome white, expanded, the right margin subangular 

 above, the margins joined by a rather thick, compressed, subsolute 

 callus. Length 16-19, diam. 4 mill.; aperture with peristome 3J to 

 4 mill, long, 3J wide (Doer.). 



