44 ODONTOSTOMUS. 



O. FiD^ENsis (Moricand). 



See vol. XI, p. 232. This species, described from Baliia, is prob- 

 ably referable to the present group rather than to Dryntseus. 



0. WILLI (Dohrn). PI. 9, figs. 9, 10. 



Shell deeply rimate, fusiform, thin, glossy, spirally narrowly 

 striate, irregularly submalleate ; whitish, flamed with remote, irreg- 

 ular brown streaks, the apex white ; delicately and sharply striate 

 longitudinally ; suture irregularly ctenulate- impressed, the impressions 

 brown-spotted. Whorls 8-9, a little convex, the last about two-fifths 

 the shell's length, tapering at the base, compressed, columella folded 

 and subangulate. Aperture oblong, the base effuse, receding; peri- 

 stome simple, marked with a brown stripe within, expanded, widely 

 reflexed at the brown-streaked columella. Length 2832, diam. 

 9-9^, length of aperture 12^-14, width in the middle 6 mill. (Dohrn). 



A variety (fig. 9) has the shell shorter, more swollen, the aperture 

 wider and less effuse at base, the outer margin of the peristome regu- 

 larly arcuate. Length 2G^, diam. 9^, length of aperture 11-^, width 

 7 mill. (Dohrn}. 



Brazil : probably in eastern Minos Geraes, near the Mucury 

 River (Will). 



Butimus willi DOHRN, Jahrb. d. Malak. Gesellsch., x, p. 350, pi. 

 11, f. 5, and var. 6 (1883). 



(,)uite similar to B. angvlatus Wagn., but much smaller and 

 prettier, and differing in the sculpture of the whorls and suture. 

 Of the impressed spiral lines a few, about every sixth or eighth, are 

 more strongly sunken than those between them, and are visible to 

 the naked eye. The variation in form leads me to think that the 

 difference between B. angulatus and B.fusiformis may be only in- 

 dividual (Dohrn). 



It seems to be related to 0. fidaensis. 



O. NASUTUS (Martens). Not figured. 



Shell rimate-perforate, fusiform, conspicuously reticulate-malleo- 

 late, finely lineolate spirally ; pale corneous, streaked with brown 

 and painted with more or less close spiral white hair-lines, the apex 

 blackish-chestnut. Whorls 8, rather flat, regularly increasing, the 

 first 3 smooth, lines and threads vanishing on the last whorl, which 

 is distinctly attenuated below. Aperture three-sevenths the length 



