ART. 2 NEW MOLLUSKS FROM SOUTH AMERICA MARSHALL t) 



aperture contains also five smaller teeth, namely, two very small ones 

 at the upper portion of the outer lip, two thin teeth near the base 

 of the outer lip, and a platelike tooth curving into the shell at 

 the base of the columellar lip. Deep within the aperture on the 

 wall of the body whorl is an obliquely set lamina aljout 7 mm. long. 

 This lamina and all the teetli in tlie outer lip show like white 

 scars through the wall of the body whorl. The true condition of 

 the armature within the shell can be seen 011137^ by breaking away a 

 portion of the back of the body whorl. A thick callus across the 

 parietal wall. 



The type (Cat. No. 380699, U.S.N.M.) measures: Height, 26 mm.; 

 diameter, 8.75 mm. ; height of aperture 10 mm. It comes from 

 Punta Chaparro, Department of Soriano, Uruguay, and vras pre- 

 sented by Prof. Auguste Teisseire. The species is related to Oclon- 

 tostomus rocae^ Doering but is much more slender. Probably it is 

 still more closely related to Odontosfomus multiplicatus Doering, 

 an unfigured species. 



ODONTOSTOMUS (SPIXIA) CHUQUISACANA, new species 

 Plate 1, Figure 2 



Shell long, tapering at top and at bottom. Thin, translucent. 

 Whorls 8%, flatly rounded, the first four chestnut color, the others 

 grayish-tawny. The apical and first three whorls are confusedly 

 vertically costulate, malleate and spirally striate. Sutures well im- 

 pressed. Longitudinal sculpture of numerous low, irregular, wavy, 

 sometimes interrupted whitish folds. At the middle of each whorl 

 the folds are somewhat weaker giving the appearance of a smoothish 

 spiral band. Spiral sculpture almost lacking, but with faint indica- 

 tions of spiral striae. Body whorl contracted at the base, angulate 

 around the umbilicus, a deep pit just behind the outer lip. Aper- 

 ture subtriangular, narrow at the base, outer lip simple, nearly verti- 

 cal, rounded just below its attachment to the body whorl; basal lip 

 slightly expanded ; columellar lip W' idely expanded, partlj^ con- 

 cealing the narrow umbilicus; a moderate callus across the parietal 

 wall. The outer lip has a prominent tooth corresponding to the 

 deep pit on its outer portion; the columella has a strong, platelike 

 twisted tooth entering the aperture ; the basal lip has a small callus 

 corresponding to a shallow groove in the imbilical area; parietal 

 wall without vestige of a tooth. 



The type (Cat. No. 380700, U.S.N.M.), measures: Height, 17.5 

 mm. ; diameter, 4.75 mm. 



It came from Province of Chuquizaca, Bolivia, and was collected 

 and presented by G. L. Harrington for whom the species is named. 



