88 ODONTOSTOMUS. 



panded, somewhat solute, the margins joined by a thick, compressed 

 callus. Length 16-22, diam. 5-6 mill. ; aperture with peri^tome 4J- 

 5|- mill, long, 3j-3f mill, wide (Doer.). Argentina. 



0. bergii DOER., Periodico Zool. ii, pt. 4, p. 246 (1877). 



This species has an extended distribution and varies within wide 

 limits, preserving, however, certain definite characters, particularly 

 the depth and length of the groove at the base, etc. 



Var. a, from Alta Gracia, collected by Dr. D. C. Berg. Length 

 18-20, width 5^ mill. ; of a narrow, very short form, light colored, 

 corneous-white. 



b. Cuesta de S. Antonio, Sierra Chica, region of Coco y Moye. 

 Length 19-22, width 5-6 mill. ; shell long and narrow, of darker 

 color, only the last whorl is more or less whitish. 



c. Cerro Salado, on the west slope of the Sierra de Aconjigasta. 

 Length 19-21, width 6, apert. with perist. 5^ mill, long, 2f wide. 

 Teeth and peristome thicker. 



O. RETICULATUS Doering. 



Shell rimate, fusiform-turreted, corneous-brown or blackish-green, 

 sculptured with very minute, elevated, close spiral lines. Suture 

 rather deep. Whorls 9, somewhat convex, the first embryonal, 

 coarsely striate, the last over one-fourth the total length, a little 

 scrobiculate-impressed in front, two-crested at the base. Aperture 

 suboval, obstructed by 5 teeth ; peristome expanded, thickened 

 within, right margin subangular above, columellar margin reflexed, 

 the margins joined by a parietal callus. Length 1718, width 5 mill.; 

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



Argentina : eastern slope of the Sierra de Aconjigasta, the heights 

 of Tablada, Plumeria, etc. 



0. reticulatus DOER., Periodico Zool., ii, pt. 4, p. 250 (1877). 



This species is intermediate between Odonto&tomus and Macro- 

 dontes [Scalarinella~] in sculpture. The whorls, especially the upper 

 ones, are ver}' convex ; the aperture and arrangement of teeth are in 

 complete agreement with the allied species. The jaw has 13 plaits. 



O. MARTENSII Doering. 



Shell rimate-perforate, fusiform, ventricose, the apex acute; 

 ashy-brown, longitudinally closely wrinkle-striate or subdecussately 

 costulate-striate ; somewhat variegated, with irregularly-spaced, Ion- 



