472 PROCEEDINGS OF THE ACADEMY OF [1898. 



odontostomus, with smaller teeth between them and another above 

 the upper one; the teeth upon the columellar and parietal margins 

 corresponding in position with those of 0. odontostomus. 



Alt. 37, diam. 12 mm. length of aperture (including peristome) 

 15, width 8 mm. 



Iguape, prov. S.. Paulo, Brazil. (Dr. H. von Ihering). 



This most beautiful of the Macrodordes species has hydrophanous 

 cuticular markings somewhat like Auris Hawxwelli (Crosse). It 

 differs conspicuously from the well known 0. odontostovius in the 

 more slender contour, basal instead of baso-peripheral position of 

 the keel, and the longer and narrower aperture, which is consequ- 

 ently more filled by the large teeth. There is also one more tooth, 

 and the striation is much finer. 0. Grayamis differs strongly in the 

 less tapering and quite differently shaped base, as well as in lack- 

 ing the median tooth of the outer lip, etc. 



Odontostomus (Macrodontes) Dautzenbergianus n. sp. 



Shell oblong-ovate, thin, light chestnut with a golden sheen and 

 sparse, narrow oblique or zigzag creamy hydrophanous markings 

 (absent on some specimens) ; surface dull, with very minute but 

 regular and sharp striation along the lines of growth, and much finer, 

 shallower, close spiral lines; the apical If whorls delicately spirally 

 lirulate. Whorls 5, the first with in-turned tip, the rest rapidly in- 

 creasing, convex, the last becoming very shortly free at the aperture, 

 somewhat compressed behind the outer lip, and with three small 

 pits; the base pinched into a short keel, behind the columellar lip 

 two-pitted, with a deep umbilical fissure. Aperture irregularly 

 oblong; peristome continuous, reddish or flesh colored, narrowly 

 reflexed, the upper margin with a small blunt tooth, outer lip with 

 three small teeth within, the lowest low and wide, the upper two 

 minute and acute, whitish; basal lip with one low, wide tooth, the 

 columella with a strong oblique fold upon which a minute whitish 

 denticle is placed, another one being situated below the columellar 

 fold. 



Alt. 26, diam. 11 mm.; length of aperture 12, width 7i mm. (in- 

 cluding peristome). 



Raiz da Serra, Sao Paulo, Brazil (Dr. H. von Ihering). 



This species, to which we have attached the name of a distin- 

 guished French conchologist, is obviously a member of the 0. odon- 

 tostomus group of Macrodontes, agreeing with those forms in the posi- 

 tions of the denticles ; but in our species the armature of the aper- 



