1895.] NATURAL SCIENCES OF PHILADELPHIA. 22] 



cal with that of A. Cookei, the latter must rank as a variety of the 

 former. 



Named in honor of Hon. C. M. Cooke, by whose sons the shell 

 was discovered. 



Section PARTULINA Pfeitfer. 

 Achatinella Dolei, u. sp. PI. X, figs. 17, 18. 



Shell sinistral, minutely perforated, somewhat solid, acuminately 

 ovate conic, apex acute ; surface shining, marked with delicate incre- 

 mental striae, under a lens exhibiting extremely close, minute, de- 

 cussating spiral striae ; nuclear whorls faintly cross-lined. Color 

 white, encircled below the periphery with a brownish black band, 

 and at the periphery and above with more or less numerous, deli- 

 cate, chestnut, spiral lines, which become fainter on the middle 

 whorls and obsolete above. Whorls 6-V, narrowly margined above, 

 convex ; the last somewhat inflated, roundly angulated at the peri- 

 phery and flattened on the base ; suture deeply impressed. Aper- 

 ture oblique, roundly ovate, flattened on the basal margin, white, 

 exhibiting the brown markings of the exterior ; peristome acute, 

 angled at the periphery, slightly thickened within, expanded, basal 

 and columellar margins narrowly reflexed ; columella terminating 

 in a long, flexuous, white plait. 



Length, 24 2 ; diam. 14 mm. 



Habitat, Honomanu, Island of Maui. 



Animal when extended in motion longer than the shell. Mantle 

 intensely black with a broad outer margin of yellow and a conspicu- 

 ous orange spot in the center of the margin. Foot tapering behind, 

 above and below light yellow. Tentacles long and slender, light 

 slate. Head above lightly granulated. 



The dentition of this and the preceding species, as observed by 

 Mr. Suter, does not differ materially from that of the arboreal Acha- 

 tinellas generally. In both of these species a long and slender cen- 

 tral tooth is present. 



We found this species very plentiful at the above locality, in the 

 humid forests of the exterior slope of Haleakala crater, at an alti- 

 tude of 7,000 feet above sea level. The dark band below the peri- 

 phery is a constant feature. The nearest allied species is A. 

 splmdida Newc. , of West Maui. It differs, however, from this in 

 the sub-angulated periphery, flattened base, and uutessellated upper 



