216 AMASTRA, OAHU. 



bryonic whorls slightly convex and very finely striate. Later 

 whorls lightly marked with growth-wrinkles. The cuticle is 

 thin and polished, occasionally worn in front of the aperture, 

 and often some trace of a very thin lusterless outer coat re- 

 mains in patches on the last whorl, 'hardly noticeable except 

 by aid of a lens. Whorls moderately convex. Aperture ob- 

 lique, white inside, the outer lip thin, with a dark border 

 within. Columellar plait small. Columellar margin short 

 but rather broadly reflexed, generally leaving an umbilical 

 crevice. Length 21, diam. 11.5, aperture 9.7 mm. ; whorls 7. 



Oahu, western range: Waianae, Lihue, almost exclusively 

 on the ground (Gulick) ; below Kaala on the lee side (Per- 

 kins). Lives on low bushes and ferns. 



Helix spirizona FER. (Prodrome, Tab. Syst., p. 56, nude 

 name), Voyage autour du Monde de I'Uraniie et la Physici- 

 enne, Zoologie, p. 480; Histoire, pi. 155, f. 14, 15. Helicteres 

 spirizona BECK, Index, p. 51 (1837). Achatinella spirizona 

 Fer., PPR., Monographia, ii, 235; iii, 458; iv, 548; vi, 179; 

 viii, 238. NEWCOMB, Ann. Lye. N. H., vi, p. 307. REEVE, 

 Conch. Icon., vi, pi. 2, f. 16. Amastra spirizona Fer., SYKES, 

 Fauna Hawaiiensis, p. 344, with var. nigrolabris and rudis 

 Achatinella acuta SWAINSON, Quart. Journ. Sci. Lit. Arts, i, 

 1828. p. 84; Zool. Illustr., ser. 2, iii, pi. 99, f. 3. Achatinella 

 baetica Mighels, in Cunning 'Coll., undescribed. 



According to Newcomb, the animal is "thickly studded 

 with very black granulations with the interstices of a light 

 slate; mantle of a yellowish-white." 



This well-known shell is easily recognized by its rich, dark 

 coloration. Ferussac's excellent original figure is copied in 

 our fig. 16. The original description follows: "Shell dextral, 

 conic, acute, .striate, of a brown color encircled with a white 

 band at the suture, the apex black-brown. Whorls 6, grad- 

 ually increasing; suture not duplicate. Aperture coarctate, 

 oval ; peristome thick within, violaceous. Columella nearly 

 straight, provided with a distinct rib ; an umbilical crevice. 

 It probably inhabits the Sandwich Islands." 



The original locality is not known with certainty. The 

 Vranie Achatinellida?, with two exceptions, were from Nun- 



