ODONTOSTOMUS. 87 



0. chanconimis DOEK., Periodico Zool. ii, pt. 4, p. 248 (1877); 

 Jalirb. (1. D. Malak. Ges., 1878, p. 134. BuUmus cltancaninus 

 Doer., KOBELT, Jahrb. vii, 1880, p. 290, pi. 9, f. 13, 14. 



Similar to 0. saHnicola and 0. subsexdentatus, but more ventricose 

 and fusiform. It is smaller than the latter, the apical portion much 

 more delicate, generally decollate, the stria? are coarser, and the 

 shell more fragile. It is larger and more ventricose than the former 

 species. 0. chancaninits is larger and more straight!}' tapering than 

 0. charpentieri, which has the same arrangement of lamellae and 

 folds. 



* 



O. SALINICOLA Doering. 



Shell rimate, fusiform, nearly smooth, scarcely pellucid, subopaqae, 

 variegated with irregular longitudinal pellucid corneous or corneous- 

 brown stripes. Apex attenuated when perfect, and a little obtuse ; 

 frequently decollate ; suture rather deep. Whorls 10, a little convex, 

 the first 5 buff" corneous, attenuated, those following somewhat varie- 

 gated, substriate ; the last whorl little impressed in front, two-crested 

 at the base. Aperture angularly suboval, obstructed by f> teeth ; 

 peristome expanded, somewhat acute, thickened within, the right 

 margin lightly arcuate above, basal margin expanded, columellar 

 margin reflexed. Length 22, width G mill.; aperture with peristome 

 6^ mill, long, 4 wide (Doer.). 



Argentina : Saline plains at the foot of the western slope of the 

 Sierra de Aconjigasta, Dep. Chancani. 



0. salinicola DOEK., Periodico Zool. ii, pt. 4, p. 247 (1877). 



Of fusiform contour, with the first 5 whorls narrow, a little trans- 

 parent, opaque in the middle but not calcareous in fresh specimens. 

 The impression on the last whorl around the aperture is pretty dis- 

 tinct, and the aperture quite ample. 



(). BERGII Doering. 



Shell rimate, fusiform-turreted, pellucid, rather smooth or irregu- 

 larly substriate, pellucid, pale corneous or brownish-corneous. Spire 

 fusiform-turreted, the apex a little attenuated, slightly obtuse. Whorls 

 10, a little convex, the first corneous-brown, slightly substriate, the 

 last usually paler, about one-fourth the length, impressed in front, 

 strongly two-crested beneath. Aperture angularly sub-oval, ob- 

 structed by 5 teeth : peristome white, thickened within, widely ex- 



