170 ODONTOSTOMUS. 



Odontostomus in the Periodico Zoologico, vol. 1, part 3, pp. 

 172-180. 



O. GEMELLATUS Ancey, n. sp. 



" Shell oblong-tapering, rather solid, ashen-whitish, obliquely 

 rimate, obliquely costulate except at the apex. Spire oblong, the 

 sides a little convex, apex obtuse, sculptured as in 0. pupoides. 

 Whorls 7^, a little convex, regularly increasing, separated by a 

 moderate suture, the last whorl oblong, very shortly ascending at 

 the aperture. Aperture nearly vertical, truncate-oval, ringent, 

 obstructed by teeth or folds as follows : Two on the parietal wall, 

 one large, elongated, prominent, situated near the posterior angle, 

 the other smaller and more deeply placed, at the base of the larger 

 one, and in the middle of the parietal wall ; a large, twisted, sub- 

 quadrate and tongue-shaped tooth on the columella ; two subequal, 

 rather small and acute basal teeth ; and within the outer lip there 

 are three teeth, the lower strong, twisted, opposite the columellar 

 lamella, the others rather small and acute. Peristome thickened 

 and dilated, expanded, white, the margins distant ; marked with 

 brown on each side of the bases of the teeth upon the outer lip. 

 Length 20, diam. 7|, alt. apert. 7^ mill." (Ancey). 



Goyaz, central Brazil. 



" Of the size and shape of 0. pupoides, but strongly and regularly 

 sculptured. The teeth also are dissimilar " (Ancey). 



O. TUDICULATUS (Martens). PI. 26, figs. 40, 41, 42. 



This vol., p. 55. Fig. 40 represents a specimen from Taguara do 

 Mundo Novo, Rio Grande do Sul, collected by Dr. von Ihering in 

 1881, and determined by Prof, von Martens. It measures, length 

 21^, diam. 6, length of aperture 7 mill.; whorls nearly 8. 



Other specimens from Bahuru, Sao Paulo (no. 1279 coll. Mus. 

 Paulista), received from von Ihering, differs in having the spire 

 somewhat more attenuated, and the teeth within the outer lip more 

 or less deficient. In the specimen represented in fig. 41 there are 

 upper and lower palatal folds and the faint trace of a suprapalatal. 

 In that shown in fig. 42 only the upper palatal is developed, and 

 that but weakly, though close inspection with a lens shows very 

 slight vestiges of basal and suprapalatal folds. The basal carina is 

 reduced. Except by their small size, there is little or nothing to 

 separate such specimens from 0. janeirensis var. miliola. 



