228 AMASTRA, OAHU. 



light 'horn-color, encircled by numerous narrow brown bands. 

 Length sixteen- twentieths, diam. six- twentieths of an inch' 7 

 [20x7.5 mm.] (Newc.). 



"Animal light gray, marbled with dusky triangular patches, 

 mantle light gray, tentacles dark, granulations strong ; a dor- 

 sal and two obscure lateral white lines extend from the head 

 along the animal" (Newc.}. 



Oahu: Waianae (Newcomb) ; near Mt. Kaala (Thwing). 



Achatinella cylindrica NEWC., P. Z. S. Lond., 1853, p. 134, 

 pi. 22, f. 11 (1854) ; Ann. Lye. N. H. of N. Y., vi, p. 325 (ani- 

 mal) . PFR., Monogr., iv, 555. THWING, Orig. Descr., p. 156. 



This shell has some resemblance to A. frosti, but that is 

 smaller, with more straightly turrited spire, the last whorl 

 shorter and more convex. In A. variegata the outlines of the 

 spire are straight, while in cylindrica they are typically quite 

 distinctly convex, as in Newcomb 's figure which we have 

 copied, pi. 34, fig. 13. 



The embryonic shell has a rather narrowly conic shape, as 

 in A. variegata, not so blunt and rounded as in A. rubens. It 

 is very finely striate, as in variegata. In color it varies from 

 purplish-red to whitish-corneous, but the lighter tint prevails. 



Newcomb 's measurement of the diameter was no doubt 

 erroneous ; his figure shows no such proportions as the assigned 

 dimensions would indicate. Specimens received from him 

 measure : 



Length 18.5, diam. 9, aperture 7.8 mm. ; 6% whorls. 



Length 18.3, diam. 9, aperture 8 mm. ; 6~y 2 whorls. 



The adult shell has variously-placed spiral lines and zon< 

 of red-brown on a paler ground, which under the lens sho) 

 whitish stride with fleshy or creamy intervals, giving a creai 

 or fleshy appearance to the eye. Over this there is an e: 

 tremely thin, dilute brown outer cuticle, worn off in front 

 the aperture, or sometimes extensively lost. The sculpture 

 strongly developed and rather irregular. The outer lip is 

 little thickened within. Pig. 16 was drawn from a typi< 

 specimen received from Newcomb (no. 57689 A. N. S. P.). 



In the same lot with several typical specimens from N< 

 comb there is a narrower shell with almost straightly turril 



