72 ODONTOSTOMUS. 



lower palatal fold being reduced to a slight prominence or entirely 

 wanting. 



Length 40, diam. 12, length of aperture 11 mill, (typical dimen- 

 sions). 



Length 38J, diam. 13, length of aperture 12 mill. 



Length 35, diam 12, length of aperture 10^ mill. 



Brazil : Matto Grosao at Corumbd, under loose limestone (H. H. 

 Smith). 



Close to var. major Orb., from which it differs in lacking a lower 

 palatal fold. The locality is near that of var. minor Orb. It varies 

 a, good deal in size and comparative width, as the above measure- 

 ments of Corumba specimens indicate. 



O. HILAIRII (' Gray ' Pfeiffer.). 



Shell perforate, ovate-acuminate, solid, smooth ; white, with a 

 single rufous band ; spire conic, acute ; whorls 7^, a little convex, 

 strongly plicate longitudinally below the suture, the last whorl about 

 two-fifths the total length, ventricose, with compressed base. Aper- 

 ture obliquely oblong, showing teeth ; peristome roseate, broadly ex- 

 panded, thickened, reflexed, the margins joined by a callus; a 

 lamella on the parietal wall, another upon the columella, a smaller 

 tooth at the base, and a larger flat-topped one within the right mar- 

 gin. Length 30, diam. 13, length of aperture inside 10, width 5 

 mill. (Pfr.'). Brazil. 



Bulimus MamY a Gray in coll., PFR., Zeitschr. f. Malak., 1845, p. 

 157 ; Monogr. ii., p. 84. 



The arrangement of teeth in this unfigured species reminds one of 

 0. spixii, but it is a shell of stouter figure, and plicate under the 

 sutures. Known to me by the original description only. 



O. PYRIFORMIS Pilsbry, n. n. PL 12, figs. 71, 72. 



Shell rimate-perforate, ovate-conic, with exserted and very much 

 attenuated spire, rather solid, gray-whitish, the apex brownish, 

 slightly shining. Whorls 8, a little convex, the first 2^ smooth, 

 those following costu^ate-striate, separated by a distinct linear 

 suture, the last whorl somewhat inflated, the base compressed into a 

 rounded carina, the outer margin pitted behind the lip. Aperture 

 subquadrate-ovate, with five lamellae: the first compressed on the 

 parietal wall ; another arcuate lamella on the upper part of the colu- 



