174 Original Descriptions of Achatinella. 



5. Sliclls from East Maui. 



317. Achatinella mastersi Newcomb. 



A. mastersi Nevvc. P. Zool. Soc. London, 1853, p. 153, pi. xxix, fig. 67, 



Shell dextral, thin; whorls 7, rounded, slightly rugose above, 

 the last strongly inflated; apex acute, suture well impressed; aper- 

 ture ovate; lip simple; columella short with a thin lamellar plait; 

 color of shell white or rich chestnut, with traces of a thin brown epi- 

 dermis; within white or bluish white. L,ong. 16/20, lat. 8/20 poll. 



This species I dedicate to S. I. Masters, Esq., who has been 

 indefatigable in his researches on the islands of Oahu, Maui and 

 L,auai, and who has furnished many choice and beautiful shells of 

 this genus before unknown to science. 



The size varies much in this species and the color is also vari- 

 ous, running from pure white through various tints to a light 

 mahogany. The lower part of the shell is not unfrequently white, 

 and the upper portion bright chestnut or rose-colored. — Newc. 



Hab. Makawao. 



318. Achatinella nana Baldwin. 



Amastra nana Bald. P. Ac. Phil., 1895, p. 232, pi. xi, figs. 48, 49. 



Shell dextral, imperforate, rather thin, ovately conical, apex 

 subacute; surface lustreless, striated with fine incremental lines, 

 the two and one-half embryonic whorls finely, radiately sulcated; 

 the color varies from light to dark brown, the basal half of the 

 body whorl sometimes of lighter shade than the upper portion; 

 covered with a black or earthy brown, fugacious epidermis, often 

 laid on with alternating undulations, or zigzag markings; whorls 

 6, somewhat convex; suture impressed; aperture oval, a little 

 oblique, white with a purplish tinge; peristome simple, very thin; 

 columella purplish-white, flexuous, abruptly terminating in a thin 

 lamellar plait. Length n 1-2, diam. 61-2 mm. 



Animal when extended in motion as long as the shell. Mantle 

 light brown. Foot above and below brown with spots of deeper 

 shade on the sides. Tentacles and front above almost black. 



This is one of the smaller of the Amastra forms. It is about 

 the size of Amastra petricolor Newc. from Molokai. — Bald. 



Hab. Makawao. — Bald. 



319. Achatinella affinis Newcomb. 



A. affinis Newc. P. Zool. Soc. London, 1S53, p. 142, pi. xxiii, fig. 35. 



Shell acutely conical; whorls 6, rounded, not margined; suture 

 well impressed ; aperture ovate ; lip thin; columella with a white 



