ODONTOSTOMUS. 53 



O. GUARANI (Orbigny). PI. 10, figs. 29, 30. 



Shell elongate, pupoid, conspicuously umbilicate, thin, uniform 

 gray-brown ; marked with strong, conspicuous striae, especially at 

 the suture, changing to strong ridges on the anterior part of the last 

 whorl, and very strong within the umbilicus. Spire long, swollen, 

 obtuse at the apex, composed of 9 very slightly convex whorls, sepa- 

 rated by a smooth, hardly sunken suture. Aperture oblong, the 

 peristome thin and acute; columella wide, twisted, bearing a single 

 strong fold. Length 23, diam. 8J mill. ( Orb.). 



Argentina: Banks of the Parana in river debrie, in the provinces 

 Corrientes and Missions. 



Helix guarani QRK., Mag. de ZooL 1835, p. 21. Bulimus guarani 

 ORB., Voyage, p. 318, pi. 41 bis, f. 1. PFR., Mon. Hel. Viv. ii, p. 

 206; iii, 427 ; iv, 487; vi, 132. Cyclodontina guarani BECK, In- 

 dex, p. 88. 



0. neglectus Pfr. is apparently near this species, differing perhaps 

 in the basal impression, which Orbigny does not mention. The. 

 apical sculpture of guarani is unknown to me. 



0. LONGULUS (' Behn' Pfeiffer). Unfigured. 



Shell imperforate, turreted-fusiform, rather thin, striatulate; 

 whitish, marked with obsolete corneous and some reddish streaks. Spire 

 very long, acute. Whorls 11, a little convex, the last about equal to 

 two-sevenths the alt., attenuated at base. Aperture oblique, narrowly 

 reversed-ear-shaped ; peristome simple, unexpanded, the right margin 

 strongly curved above. Columella with a twisted fold, alt. 30, diam. 

 7^ mill.; aperture 9J mill, long, scarcely 4 wide (Pfr., from type.) 



Brazil : Chicatas (Cuming coll.). 



Bulimus longulus Behn, PFR., Malak. Bl. vi, p. 44, 1859 ; Monogr. 

 vi, p. 107. 



The position in the series of this species is unknown to me, but it 

 seems near 0. guarani. 



O. SURGILLATUS (Pfeiffer). 



Shell narrowly umbilicated, oblong-turreted, thin, irregularly 

 plicate-striate ; corneous, marked with subpunctate opaque white 

 streaks and some rufous ones. Spire long-conic, acute ; suture very 

 slightly crenulated. Whorls 9, convex, the last about two-fifths the 

 total alt., subcompressed at base; columella slightly and straightly 



