1S8 Descriptions of New Species of Achatinelia. 



Length 0.25 inch (61 mill.). Breadth 0.11 inch (2f mill.). 

 Length of body whorl 0.14 inch (3$ mill.). 

 Average weight 0.11 grain. 



Station. — Under stones in the open fields. T. L. G. ! 



Habitat. — Mokuleia, Oahu. T. L. G. ! 



Remarks. — A small cylindrical species, of clear glassy ap- 

 pearance, resembling a Bulimus in aperture and columella, but 

 nevertheless a true Achatinelia, as its affinity to A. crystallina 

 Xob. indicates. It represents more nearly than any other the 

 Oahu species, the A. grana Newc. (found on E. Maui), from 

 which it differs chiefly in its larger size, more elongate form, 

 and glassy transparency. From A. crystallina it differs in 

 slender form and smooth columella with umbilical cleft. 



16. Achatinelia exilis. 



Plate VI. Fig. 16. 



T. dcxtrorsa, subperforata, cylindraceo-turrit&, gracili, tenuissima» 

 nitida, perpellucida, vitrea, sub lente vix striata ; apice obtusula ; spira 

 turrito-elongata ; sutura simplici, vix impressa; anfr. 0, planiusculis i 

 plica columellari levi, profunde intra aperturam terminata ; apertura 

 vertical], truncato-elliptica ; perist. simplici, tenui ; margine dextro recto, 

 arcuato ; columellari dilatato, tenui, vitreo, patente ; parietali nullo. 



Shell dextral, subperforate, cylindrically turreted, slender, 

 very thin, shining, transparent, vitreous, scarcely striated 

 beneath the lens ; apex somewhat obtuse ; spire turretly elon- 

 gate ; suture simple, scarcely impressed ; whorls 6, somewhat 

 flattened ; columellar fold slightly developed, terminating deep 

 within the aperture ; aperture vertical, truncately elliptical ; 

 peristome simple, thin ; with dextral margin unreflected, arcu- 



