104 Original Descriptions of Acliatinella. 



VARIABILIS GROUP. 

 164. Achatinella variabilis Newcomb. 



A. variabilis, Newc. 1'. Zool. Soc. London, 1K53, p. 154, pi. xxiv, fig-. 70. 



Shell sinistral or dextral, conically acuminate, polished, shin- 

 ing ; whorls 6, rounded, lightly margined above ; aperture round- 

 ly ovate ; columella short, armed with a strong tubercle of a rose* 

 ate colour; lip expanded, acute; colour of shell white, yellow, black 

 and other shades, plain or with from one to six bands of various 

 colours on the last whorl. Long. 14/20, lat. 8/20 poll. 



This is the most variable species in markings that has yet been 

 found among the Achatinellae. It is extremely difficult to find two 

 (except the plain ones) precisely alike in this respect. — Newc. 



Hab. Above Waiapaa. — Perkins. 



165. Achatinella semicarinata Newcomb. 



A. semicarinata Newc. P. Zool. Soc. London, 1S53, p. 156, pi. xxiv, fig. 76. 



Shell dextrorsal, solid, ovately conical, longitudinall}- sub- 

 striated ; whorls 5, flattened, marginate above the last, angulated 

 in the middle and semicarinated ; aperture ovate ; columella end- 

 ing in a tortuous, obtuse, dentiform plait ; outer lip anteriorly 

 produced, strongly marginate within ; colour pale yellow ; aperture 

 white internally. 



A straw-coloured conical species, with the last whorl partially 

 surrounded with an elevated keel. — Newc. 



Hab. Lanaihale. 



166. Achatinella lactea Gulick. 



A. lactea Gk. Ann. I.yc. New York, vi, 1856, p. 19S, pi. iv, fig. 27. 



Shell sinistral, perforate, acuminately ovate, solid, shining, 

 finely striated, and microscopically very finely decussated, color 

 ivory white ; apex acute ; spire conical, with outlines slightly con- 

 vex ; suture marginate, slightly impressed ; whorls 6 1-2, flatly 

 convex ; columellar fold central, brown, strong ; aperture oblique, 

 siuuately oval, reddish brown within ; peristome white, thickened 

 within ; with external margin arcuate, slightly reflected anteriorly; 

 columellar margin dilated, slightly detached ; parietal margin thin. 



Length 0.86 in. (22 mill.), breadth 0.45 in. (11 2-5 mill.). 



Length of body whorl 0.59 in. (15 mill.). 



Weight 8.00 grains. 



Remarks. A rare shell allied to A. variabilis Newc, but well 

 characterized as a distinct species. — Gk. 



Hab. Above Waiapaa. — Perkins. 



