182 AMASTRA, OAHU. 



so strong a columellar fold as orientaUs, but it differs in little 

 except geographic range. A specimen in coll. C. M. Cooke 

 shows that this form extends over the crest of the range into 

 Kahana valley. 



25d A. reticulata errans n. subsp. PI. 29, figs. 12, 13. 



Shell with the general shape of A. reticulata, but thinner, 

 less obese, with thinner or sometimes scarcely any thickening 

 within the lip or on the columella, aside from the lamella, 

 which is thin but broad. Axis rimate in two out of three ex- 

 amples. Color chestnut of varying shades, with spiral lines 

 of yellow spots, sometimes many (fig. 13), sometimes very few 

 or scarcely noticeable. 



Length 12.2, diarn. 7.3, aperture 6.5 mm. ; whorls 5*4. 



Length 13, diam. 7.5, aperture 7 mm. ; whorls 5%. 



Waimano. Types no. 1133 C. M. Cooke coll. ; also Kahana. 



A small race, the thin texture of which is probably due to 

 insufficient supply of lime. It occurred with a thin form of 

 A. breviata. Two shells from Halawa, on the north aide of 

 the range some distance northwest of Waimano, are similar 

 but slightly more solid. One is stippled with buff on an olive- 

 yellow ground, the other red-brown with indistinct contin- 

 uous lighter lines. 



26. A. COOKEI n. sp. PI. 38, figs. 4, 5. 



The shell is narrowly perforate, oblong-conic, moderately 

 solid, glossy, without trace of dull or deciduous cuticle. 

 Whorls very weakly convex ; outlines of the spire somewhat 

 convex, becoming straight near the apex. Embryonic whorls 

 faintly, finely striate (somewhat worn), following whorls 

 marked with slight growth-lines, the last two having short, 

 irregularly developed folds below the suture. The spire is 

 reddish-brown ; penultimate and last whorls profusely varie- 

 gated with short, forwardly-descending yellow markings and 

 oblique streaks along growth-lines, and becoming brown be- 

 hind the lip. Two imperfect, bands of the dark ground-color 

 are visible. Aperture small, purplish within, the outer lip 

 thin. Columellar margin brownish, expanded above, bearing 



