180 Original Descriptions of Achatinella. 



Prof. Henshaw reports other similar localities on the island of 

 Hawaii, where there are extensive deposits of fossilized land shells 

 about a foot below the surface of the humus. Nearly all the known 

 genera of Hawaiian land shells are represented in these deposits 

 by species, some still extant, others probably now extinct. The 

 deposit of earth above the fossilized shells indicates several hun- 

 dred years of antiquity. — Bald. 



Hab. Hamakua. — Bald. 



333. Achatinella fossilis Baldwin. 



Amastra fossilis Bald. Nautilus, Boston, 1903, vol. xvii, p. 35. 



Shell fossil, dextral, minutely perforated, somewhat solid; 

 elongately conical, apex rather acute; surface striated with some- 

 what irregular growth lines; embryonic whorls under a lens exhib- 

 iting very delicate and regular sulcations; color of living shell 

 unknown; whorls 7, slightly convex; aperture oblique, ovate; per- 

 istome simple, very thin, columellar margin slightly expanded 

 over the umbilicus; columella terminating in a fiexuous thread- 

 like plait. Length 18, diam. 9 mm. 



This shell in shape resembles some of the forms of Amastra 

 turritella Fer., which is found on the island of Oahu. — Bald. 



Hab. Hamakua. — Bald. 



334. Achatinella saxicola Baldwin. 



Amastra saxicola Bald. Nautilus, Boston, 1903, vol. xvii, p. 36. 



Shell dextral, imperforate, rather solid, elongately ovate-conic, 

 apex subacute; surface lustreless, sculptured with delicate growth 

 lines; embryonic whorls smooth and polished; color reddish-brown, 

 tending to lighter shade on the middle whorls; apex pearly white; 

 destitute of the usual fugacious epidermis of this genus; whorls 7, 

 slightly convex ; suture well impressed ; aperture ovate, a little 

 oblique, pinkish within; peristome simple, acute, not thickened 

 within, extremities joined by a very thin, pinkish parietal callosity; 

 columella white, fiexuous, terminating in a moderately developed 

 lamellar plait. Length 20 1-3, diam. 10 mm. 



This shell seems to live among and under rocks to an unusual 

 degree. It is found on old lava flows attached to the under side 

 of rocks, or in loose soil and trash at the base of bunch grass 

 growing on lava flows. The locality is very arid. — Bald. 



Hab. Kau— Bald. 



