8TROPHOCHEILUS-BORU8. 31 



S. CAPILLACEUS Pfeiffer. PI. 14, fig. 69. 



Shell oval or ovate, thin and light, closely and finely rib-striate 

 on the earlier whorls, more irregularly wrinkle-striate on the body- 

 whorl, at least above. Light brown under a thin brownish cuticle, 

 which has a tendency to be deciduous in spiral bands. Suture more 

 or less crenulated. Whorls 5-5 , the earlier 1 or 2 planorboid, 

 forming a very obtuse apex; post-nepionic whorls li-lf, the last 

 whorl evenly convex. Aperture large, decidedly over half the 

 shell's length, brown within ; outer lip narrowly reflexed, pink, 

 evenly curved ; columella as in oblongus ; parietal callus light, thin, 

 transparent or pinkish. 



Alt. 58, diam. 38 ; alt. apert. 35 mill. 



Alt. 61, diam. 37 ; alt. apert. 35 mill. 



Banks of Upper Amazon (Solimoes) River (Yates) ; Miobamba, 

 Brazil (Swift) ; Moyobamba, in the middle forest region of N.-E. 

 Peru, 870 meters (Stiibel). 



B. capillaceus PFR., P. Z. S., 1855, p. 93 ; Monogr. iv, p. 367 ; 

 vi, 12. HUPE, in Castelnau's Exped., p. 26, pi. 4, f. 3. B. oblon- 

 gus var. capillaceus MARTENS, Novit. Conch., v, p. 19 ; Conchol. 

 Mittheil., i, p. 157. 



This seems to me perfectly distinct from S. oblongus in the 

 smaller size, fewer whorls, much more obtuse apex, etc., so far as I 

 may judge from the 10 specimens I have seen. 



Yar. SENERI Jousseaume. PI. 30, fig. 23. 



Shell umbilicated, solid, ovate, irregularly plicate-rugose and mal- 

 leated, white, whorls 5, slightly convex, the last ventricose, about f 

 the shell's length ; suture crenulated, aperture ovate oblong, dilated 

 at base, milk-white inside ; peristome thickened, narrowly expanded 

 and reflexed, white with a slight rose tint, its ends joined by a 

 spreading callus ; right margin thicker, columellar much dilated. 

 Alt. 70, width 37 ; aperture alt. 35, width 20 mill. (Jouss.). 



V. S. of Colombia (Jouss.). 



Borus seneri Jouss., Bull, de la Soc. Zool. de France, 1884, p. 169, 

 pi. 4, f. 3. 



Differs from Borus oblongus in the smaller size, embryonic nucleus 

 very large, thick shell, strong wide irregular riblets, forming pro- 

 jecting teeth at the suture; umbilicus large and deep; peristome 

 white, slightly washed with rose ; columellar margin very wide ; plane 

 of the aperture forming an angle of 20 with the axis. 



