Original Descriptions of Achatinella. 161 



Animal of a uniform brown color; the head above and tentacles 

 of a darker shade. The action of the heart is plainly visible 

 through the thin texture of the shell. 



Hab. Waianae Valley. — Bald. 



284. Achatinella tenuispira Baldwin. 



Amastia tenuispira Bald. P. Ac. Phil., 1895, p. 232, pi. xi, fig. 51. 



Shell dextral, imperforate, solid, acuminately turreted, spire 

 conical, apex subacute; surface lustreless, covered with somewhat 

 rude, irregular incremental striae; the embryonic whorls very 

 finely radiately sulcated; color light brown, upper whorls darker; 

 covered with an earthy brown, fugacious epidermis ; whorls 7, 

 somewhat convex, in some examples slightly margined above; 

 suture well impressed; aperture oval, oblique, rather small, light 

 brown within; peristome simple, acute, extremities united with a 

 callosity ; columella subbiplicate, light brown, tortuous, abruptly 

 terminating in an oblique, dentiform plait. Length 17, diam. 

 61-2 mm. 



Hab. Kaala Mt.— Bald. 



284 a. Achatinella frosti Aucey. 



Amastra frosti Anc. Mem. Soc. Zool. France, v (1892), p. 719. 



Testa minute et angustissime rimata, conoideo-turrita, nitida, striis in- 

 crement! minutis pliciformibus plus minusve obsoleta impressa, luteo-sta- 

 minea vel fulvido-lutea, lineis spiralibus numerosis varie dispositis, exilibus, 

 persaepe conjunctis, badiis cincta. Spira elongata conoideo-attenuata, acuta. 

 Anfractus 8, primi concolores, planulati, sequentes paulatim convexiusculi, 

 sutura impressa, ultimus major, subattenuatus, rotundato-ovalis. Apertura 

 distincte obliqua, baud ampla, irregulariter ovalis, supra attenuata. Colu- 

 mella modice incrassata, albida, plica acuta, prominente, unica, a basi remoto 

 oblique armata. Peristoma simplex, acutum, marginibus callo nitido in 

 adultis junctis. Long. 20, diam. 8 1-2, alt. apert. 7 mill. 



Shell minutely and very narrowly perforate, conoidally tur- 

 reted, glossy, more or less obsoletely impressed with minute plicae- 

 like striae of growth, 3^ellowish straw-color or tawny yellowish, 

 encircled by numerous chestnut spiral lines, which are variously 

 placed, narrow, often united; spire elongate, conoidally attenuate, 

 acute; whorls 8, the first unicolorous, somewhat flat, the rest very 

 slightly convex, with an impressed suture, the last large, sub- 

 attenuate, rotundate oval ; aperture distinctly oblique, not large, 

 irregularly oval, attenuate above; columella moderately thickened, 

 whitish, furnished with a single oblique, prominent, acute fold, 

 remote from the base; lip simple, acute, in adults with the margins 

 united by a glossy callus. 



Hab. Waianae. — Bald. 



Occasional Papers B. P. B. M., Vol. III. — n. 



