120 Original Descriptions of Achatinella. 



times decollated; whorls 6 1-2, convex, margined above; the last 

 inflated, equal to 66-100 of the length; columella white, plaited 

 near the whorl, strongly twisted, not tuberculate; aperture rounded; 

 peristome expanded, reflected, very slightly thickened; with colu- 

 mellar margin reflected, adnate, or slightly detached ; parietal 

 margin wanting. 



Length 0.90 in. (23 mill.), breadth 0.51 in. (13 mill.). 



Length of aperture 0.40 in. (10 mill.). 



Weight 6.00 grains. 



Remarks. This species differs from A . fasciata Nob., to which 

 it is closely allied, in the concave outlines of the spire, in its in- 

 flated body whorl, and more expanded and reflected lip. — Gk. 



Hab. Houokowai.— (S. T. Alex.)Gk. 



Mr. Baldwin places this with tappaniana Ad. 



PERDIX GROUP. 

 194. Achatinella perdix Reeve. 



A.perdix Rve. Rve. Conch. Icon. Achat., London, 1S50, sp. 43. 



Shell ovate, ventricose, rather thin, dextral, spire exserted, 

 somewhat obtuse at the apex; whorls 6 in number, convex, mar- 

 gined round the upper part, obliquely sculptured flexuous im- 

 pressed lines; columella plicately twisted, rather callous; whitish, 

 painted and variegated throughout with olive-brown, sutures and 

 columella white. 



Animal bluish white; upper tentacles and sheath slate-colored; 

 basal margin of foot bordered with light slate; bottom of foot and 

 mantle greenish white; when extended, not longer than the shell. 

 Few species of the genus pass through a greater variet5 T of changes 

 than this, in form and markings. My collection numbers over 

 twenty, which may fairly be classed as varieties. Of many of 

 them I have examined the animal, and find no difference in color, 

 or so slight as to call for no special notice. — Newc, 



Hab. Lahaina. — Bald. 



195. Achatinella pyramidalis Gulick. 



A. pyramidalis Gk. Ann. Lye. New York, vi, 1856, p. 204, pi. vii, fig. 32. 



Shell dextral, very rarely sinistral, imperforate, pyramidal, 

 rather solid, shining, chestnut or ash-brown, with a white or yel- 

 lowish band encircling the base, with oblique white or brown 

 markings on the second and third whorls, bluish white within the 

 aperture; apex subacute; spire regularly conical, sometimes de- 



