10 STROPHOCHEILUS-BORUS. 



S. ERYTHROSOMA D. sp. PI. 22, figS. 51, 52. 



Shell nearly imperforate, ovate, solid and strong ; part roseate? 

 part white under a yellow cuticle. Surface having inconspicuous 

 growth-lines, a fine, shalloiv malleation, and dense, microscopic spiral 

 striation. Whorls 4, the first planorboid, the last obliquely descend- 

 ing. 



Aperture oblique, small and narrow, somewhat over half the shell's 

 length, white inside ; peristome reflexed, recurved, thick, rounded on 

 the face, rose-color, but white at the outer-basal portion ; there is a 

 perceptible thickening at the middle of the outer lip, but no tooth. 

 Columella roseate, narrow below, reflexed and recurved, hardly 

 widened above, and foldless. Parietal callus heavy, rose-colored to- 

 ward the margin, white within, the white extending upon the inner,, 

 upper part of columella. Alt. 53, diani. 28 mill.; aperture meas- 

 ured outside peristome, alt. 28, width 18 mill. 



Brazil (J. G. Anthony). 



Differs from S. pudicus in the micro-sculpture, thick lip and nar- 

 row aperture ; from planidens and milleri in the malleation, etc. It 

 is more nearly allied to unidentatus, which has the same sculpture, 

 but the spire is slenderer and more produced, mouth narrower, lip 

 not dentate and differently colored. 



Subgenus BORUS Albers, 1850. 



Borus ALBERS, DieHel. 1850, p. 141. ALBERS-MARTENS, Die 

 Hel. 1860, p. 191, type B. oblongus. Bulimus SCOPOLI Delicise 

 Florae et Faunae Insubricse, i, p. 67 (1786), not Bulimus SCOPOLI,. 

 Introductio ad Historian! Naturalem,p. 392 (1777). Bulimus LAM- 

 ARCK, Systeme des Anim. s. Vert. p. 90 (1801), and of MONTFORT, 

 and subsequent authors. Bulinus SOWERBY (in part), not Bulinus 

 (Adans.) MULLER, Der Naturforscher xv, p. 6 (1781), P%a 

 Drap., 1801. Strophocheilus SPIX, in part. 



Shell ovate, capacious, imperforate or nearly so, solid, the apex 

 obtuse, nepionic whorls generally longitudinally costulate, the follow- 

 ing whorls of spire with spiral rows of minute granules, last whorl 

 smoothish, malleated or granulated. Aperture subvertical, ovate or 

 trapezoidal; peristome blunt, thickened or reflexed; columella 

 with a weak fold above, or none. Type S. oblongus Mull. 



This group comprises all of the largest species, and ranges from 

 Argentina and Ecuador to Trinidad and some adjacent islands. 



