EULIMID^E. 261 



basal channel. E. FUSIFORMIS, Gabb. Tertiary, West Indies. 

 (Struct, and Syst. Conch., ii, t. 68, f. 86.) 



Genus SCALENOSTOMA, Desh., 1863. 



Imperforate, turriculated, surface not enameled, suture mar- 

 gined ; whorls numerous, the last with carinated periphery ; 

 aperture sub trigonal, entire, a little arcuated, columella simple, 

 rectilinear, forming an angle at its junction with the lip, lip 

 obliquely, deeply notched near the suture. 



Isle of Bourbon. 



Subgenus SUBEULIMA, Souverbie, 1875. 



Shell much twisted, not enameled, whorls margined at the 

 suture and with a series of varices on the right side, as in 

 Eulima,\&s\, whorl with carinated periphery, but the lip without 

 superior sinus. 



New Caledonia. 

 Genus NISO, Risso, 1826. 



Shell deeply umbilicated, turriculated, many whorled, polished, 

 apex acute ; whorls slightly convex, the last with angulated 

 periphery, aperture angulated above and below. Operculum as 

 in Eulima. 



China, Philippines, W. America. 



Bonellia, Desh., 1838, and Janella, Grat., 1838, are synonyms. 



Section YOLUSIA, A. Adams, 1861. 

 . Shell longitudinally ribbed. 

 Section PAL^EONISO, Gemmellaro, 1878. 



Shell thicker, more dilated at the base, more pupoidal in form, 

 lip with a slight posterior sinus. Secondary. N. pupoides, 

 Gemm. Lias. 



Genus HOPLOPTERON, Fischer, 1876. 



Shell very small, imperforate, elongate-turreted, shining, with 

 obtuse summit ; suture linear ; whorls continuous, the earlier 

 ones smooth, rather flattened, the others bearing on each side a 

 long, triangular, wing-like varix ; aperture rounded oval, entire, 

 lip simple, sharp. 



China. 



The minuteness of this shell and its bizarre appearance suggest 

 that it is embryonic. It is only 1-15 mill. long. 



