184 MEGASPIRA. 



p., parietal lamella; s., supracoluinellar ; c., columellar; sub., 

 subcolumellar lamellae. 



2. M. ELATIOR (Spix). PI. 28, figs. 9, 10. 



Shell rimate, cyliudric-tapering, terminating above in a 

 short, rapidly tapering cone and very obtuse apex; thin but 

 solid; yellowish-corneous, with scattered oblique reddish- 

 brown streaks and spots. First 2% to 3 whorls very finely 

 striate; subsequent whorls sculptured with oblique rounded 

 ribs as wide as their intervals, the latter more or less wrinkled 

 across, as though spirally striate. Whorls 16-18, slightly 

 convex, the last rounded below. Aperture somewhat oblique, 

 irregularly ovate. Outer lip thin, narrowly reflexed; colu- 

 mellar lip abruptly dilated above, the reflexed edge notched 

 below the dilation. Columella two-folded, the lower fold 

 slightly bifid. Parietal wall bearing an entering lamella, 

 which penetrates 4 to 5 whorls upward. The axis is slender 

 and perforate in the lower and median whorls, enlarged and 

 hollow in the upper ones. The columellar lamella is low 

 within the back of the last whorl, dilated and slightly waved 

 or smooth in the penult., its edge becoming conspicuously 

 scalloped within the preceding two whorls ; it then diminishes 

 rapidly, becoming a smooth, small lamella, which ascends to 

 the enlarged earlier whorls of the axis, where it becomes ob- 

 solete. The inconspicuous subcolumellar lamella ascends 

 hardly one whorl ; the supracolumellar is somewhat longer. 

 The basal barriers are large, erect plates, hooked at the axial, 

 a little curved at, the other end. 



Length 33.5, diam. above aperture 7.5 mm. ; whorls 17. 



Length 15, diam. above aperture 7.6 mm. ; whorls 17%. 



Brazil. 



Pupa elatior SPIX, Testacea fluv., etc., Brasiliam, p. 20 

 (1827). DESHAYES in Lam., An. s. Vert, viii, p. 183. Helix 

 (Cochlodon) elatior ORB., Synops., p. 21. Megaspira elatior 

 PFR., Symboke, ii, p. 130; Monogr., ii, p. 390 (in part). 

 BLAND, Amer. Journ. of Conch., ii, p. 64, fig. in text (internal 

 structure). Pyrgelix elata Spix, BECK, Index, p. 88. 



Smaller than M. ruscheiibergiana, with fewer whorls, much 



