ODONTnSToMl>. 51 



species by the thickening t' the suture and the arrangement of teeth ; 

 the latter resembling those of 0. rinyens, which is apparently the 

 most nearly allied species. 



Group of O.janeirensis. 



Aperture oval or oblong, the outer lip arcuate; a columellar fold 

 or lamella developed, with sometimes a small basal fold and parietal 

 lamella; no palatal folds. Surface usually rather rough, pitted, 

 malleate, wrinkled or costulate. Species allied to 0. punctatissinms, 

 in which the folds or the folds nnd lamellce have degenerated, leav- 

 ing a toothless or almost toothless aperture. Only janeirensis, miliola 

 and iieglectus are known to me by specimens. The former two have 

 typical DrymcEiis apical sculpture, but in neglectm the vertical ribs 

 predominate and are rather coarse. It may belong to Spixia (q. v.) 

 rather than to the present group. 



Possibly '* Gonyostomus centiquadrus Valenc." of Beck, Index p. 

 53 (Paraguay), may be something of this nature ; but it is merely a 

 name, never made good by description. 



O. RHODJNOSTOMA (Orbigny). PI. 9, figs. 14, 15. 



Shell elongate, turreted, umbilicate, a little rugose, somewhat 

 glossy ; grayish-white, with longitudinal brown lines ; the peristome 

 and columeHa rose, and with a large brown spot within the lip. Spire 

 long, swollen for the greater part of its length, the apex obtuse ; 

 composed of 8 slightly convex whorls, the last very large, separated 

 by a smooth suture, but little impressed. Aperture small, oval, with 

 thin, acute reristome a little reflexed ; columella wide, noticeably 

 swollen. Length 21, diaro. 7 mill. (Orb.'). 



Brazil : obtained by M. Fontaine at Rio Janeiro. 



Helix rhodinostama ORB., Mag. de Zool., 1835, p. 20. JBultmus 

 rhodinostoma ORB., Voyage, p. 317, pi. 41, f. 6-8. PFR., Monogr. 



ii, p. 96 ; iv, 407 Odontosfonn/s rhodostoma H. & A. ADAMS, Gen. 



Rec. Moll, ii, p. 152. 



Very close to the typical form of 0. janeirensis, with which it may 

 be identical. 



O. JANEIRENSIS (Sowerby). PI. 10, figs. 22, 23, 24. 



Shell rimate, fusiform-turreted. thin but moderately strong, longi- 

 tudinally streaked with opaque cream-white over ground of a pale 



