Descriptions of New Species of Achatinella. 193 



21. Achatinella terebrans. 



Plate VI. Fig. 21. 



T. dextrorsa, iinperforata, turrita, nitida, saturate fusca, cornea, 

 levissime striata ; apice obtusa, alba ; spira, turrita ; sutura simpliei, 

 subimpressa; anfr. 7£, plano-eonvexis; columella, alba, modice plicata ; 

 apertura lunata ; perist. pallido ; margine dextro recto, leviter incras- 

 sato ; columellari dilatato, adnato ; parietali tenui. 



Shell dextral, imperforate, turreted, shining, dark brown, cor- 

 neous, very finely striated ; apex obtuse, white ; spire turreted ; 

 suture simple, slightly impressed; whorls 74, flatly convex; 

 columella white, moderately plaited ; aperture lunate ; peri- 

 stome whitish ; with dextral margin unreflected, somewhat thick- 

 ened ; columellar margin dilated, adnate ; parietal margin thin. 



Length 0.44 inch (11 mill.). Breadth 0.18 inch (44 mill.). 



Length of body whorl 0.24 inch (6 mill.). 



Weight 0.50 grain. 



Var. b. — -With spire shortened, concavely conical ; body 

 whorl rounded. 



Station. — On the ground in the woods. J. T. G. ! 

 Habitat. — Kawailoa, Oahu. J. T. G. ! 



Remarks. — Resembles A. turrita and subula Nob., but is 

 thicker and heavier than either, and has fewer whorls. The 

 shorter variety seems to revert towards tho form of A. lagena 

 Nob., which in geographical relation is within five or six miles, 

 and in affinity is probably more nearly allied to this, than are 

 A. turrita and A. subula, found in more distant parts of the 

 island. The number of its whorls and its thicker structure 

 favor this opinion. 



