Original Descriptions of Achatinella. I2i 



collated; whorls 6 1-2, convex, margined with white; finelj- stri- 

 ated transversely, and microscopically decussated with faintly im- 

 pressed wrinkled spiral lines; the last regularly rounded, eqvial to 

 65-100 of the length; columellar fold well developed, white, oblique, 

 semioval; peristome thickened within, very slightly refleclied; with 

 columellar margin dilated, adnate or slightly detached; parietal 

 margin wanting. 



Length 0.85 in. (21 3-5 mill.), breadth 0.45 in. (i i 2-5 mill.). 



Length of aperture 0.38 in. {9 2-3 mill.). 



Average weight 5.70 grains. 



The dimensions of a large specimen are as follows: 

 Length o.go in. (23 mill.), breadth 0.47 in. (12 mill.). 

 Length of aperture 0.40 in. 

 Average weight 6.00 grains. 



Remarks. This shell differs from the A. splcndida Xewc, in its 

 smaller size and pyramidal form, with spire less convex, body whorl 

 less ventricose, aperture smaller and less oblique, lip less expanded 

 and reflected. It also differs in being without perforation, and is 

 ver}' rareh' sinistral. — Gk. 



The A. pcrdix Reeve differs from this in its broader and more 

 ventricose form, its more convex spire, with whorls more swollen, 

 with aperture broader, and frequently subangulated; the arrange- 

 ment of colors is also different. Looking only at the t} pe of this 

 species, it would be placed in the same group with A. splcndida, 

 3'et is so closely connected b\- intermediate varieties with A. pcrdix 

 that it has hitherto been considered a variet}' of that species. 



Var. B. With black basal bands. A small .specimen has the 

 following dimensions: length 0.80 in.; breadth 0.43 in.; length of 

 aperture 0.35 in.; weight 4.00 grains. 



Var. C. Without band. I have a small specimen of the brown 

 variety of A. splcndida Xewc. which closely resembles this. 



Var. D. With apex chestnut brown, not tessellated; very rare. 



Var. E. With irregular white spots. This variety passes into 

 A. perdix . 



Hab. Lahaiua.— (S. T. Alex.)Gk. 



196. Achatinella ustulata Gulick. 



A. jistulata Gk. Ann. Lye. Xew York, v-i, 1S56, p. 211. pi. vii, fig. 37. 



Shell sinistral, perforate, ovate-conic, obliquely produced at the 

 base, solid, scarcely shining, striated, and microscopically distinclh- 

 decussated, brown, with a whitish band encircling the base; apex 

 subacute, tessellated with white and brown; spire conical, some- 

 what curvilinear; suture simple, lighth" impressed, marked with a 



