260 AM ASTRA, MOLOKAI. 



The thin cuticle, marked with zigzag or v-like olive-brown 

 figures on a very pale ground, is characteristic; the variega- 

 tion being further produced by partial loss of the cuticle. A 

 few specimens, however, such as fig. 8, do not show zigzag 

 markings, but only some inconspicuous mottling, the cuticle 

 being streaked ; or on the last half of the last whorl it may be 

 mainly dark, with a few light streaks. In some shells the 

 cuticle is largely lost, as in fig. 13. The locality originally 

 given, "Qahu," was doubtless due to faulty labeling or a 

 mixture of specimens. No mottled Amastra occurs on that 

 island. The original description follows: 



' :< Achatinella nubilosa. Shell dextral, ovate, conic, thin, var- 

 iously mottled with dark brown on a light ground, imper- 

 forate; whorls 6, convex; aperture semi-circular; lip simple, 

 acute. Length 7, diam. .4 inch. Hab. : Oahu " (Mighels) . 



Two specimens of nubilosa received by J. H. Thomson from 

 Mighels, and sold by him to the Portland Society of Natural 

 History (no. 220) are the form described above and similar 

 to pi. 27, fig. 9. They are in poor condition. 



Mighels' type was a small example, 17-18 mm. long. Gould 

 figures a much larger, more conic shell, perhaps referable to 

 the following race. 



70a. A. n. macemta n. subsp. PI. 27, figs. 5, 6, 7 (11, 12). 



The shell is decidedly wider than nubilosa, the spire more 

 straightly conic, its whorls (especially the penultimate) less 

 convex; cuticle much lacerated or shredded, the under- tint 

 cream or very pale brownish-cream, apex fleshy or pallid; 

 interior very pale pink, rarely white. 



Length 25.5, diam. 14 to 14.7, aperture 12 to 12.5 mm. ; 6y 2 

 whorls. 



Fig. 5. Length 23, diam. 12.8, aperture 11.9 mm.; 6i/ 2 

 Whorls (no. 2086). 



Fig. 6. Length 20.3, diam. 12, aperture 10 mm. (no. 2086). 



Length 25, diam. 13, aperture 11.5 mm. ; 7 whorls. 



Fig. 7. Length 23.2, diam. 13.5, aperture 11.5 mm. 



Molokai: Cotypes no. 105549 A. N. S. P., and 2086 coll. 

 C. M. Cooke ; also nos. 2084, 2085 and 2087 Cooke coll. 



