AMASTBA, LANAI. 235 



Length 14, diam. 4 twentieths of an inch, var. major. Length 

 8y 2 , diam. 4 twentieths of an inch, var. minor. (Newc.) 



Lanai (Newcomb). 



Achatinella pusilla NEWC., Ann. N. Y. Lye. Nat. Hist, vi, 

 Oct., 1855, p. 144: Amer. Journ. of Oonch., ii, 1866, p. 211, 

 pi. 13, f. 5. Achatinella pulla Newc., PFR., P. Z. S., 1855, p. 

 209 (Feb., 1856) ; Monographic iv, 546. 



PI. 17, figs. 8, 13, 15 were drawn from specimens received 

 from Xewcomb, representing his minor variety, which may be 

 accepted as the typical form, since it is what he figured in 

 1866. The major variety, IT 1 /^ mm. long, noted in his descrip- 

 tion, is not known to us by specimens, and may be a distinct 

 species. A. pusilla is the smallest Amastra of Lanai. With 

 some resemblance to A. petricola of Molokai, this species dif- 

 fers entirely in the sculpture of the embryonic whorls. 



The outlines of the spire are convex below," a little concave 

 near the apex. The first smooth half whorl is followed by a 

 flattened, strongly-ribbed whorl, carinate close above the su- 

 ture, the ribs rather widely spaced. On the next whorl they 

 become very fine and close, persisting on the upper part of 

 the whorl, weaker below. 2% whorls comprise the embryonic 

 shell. The later whorls have growth-wrinkles only. The pen- 

 ultimate whorl is generally brown with cream-white bands 

 bordering the sutures above and below. The last whorl may 

 have creamy bands at suture, periphery and base (fig. 13) or 

 there may be several above the periphery. In other specimens 

 the last two whorls are of an opaque cream tint, with several 

 spiral brown bands, as in fig. 15. A very thin yellowish 

 cuticle, in part deciduous, covers the last whorl or two. The 

 aperture is white within and has a strong lip-rib (not shown 

 in the figures). The columellar lamella is subhorizontal. 



Fig. 15. Length 11.25, diam. 6, aperture 5 mm.; whorls 



6y 2 . 



Length 11.6, diam. 6, aperture 5.1 mm. 



Series of A. nucula. 



The following species seems to be related to the nigra series 

 of Maui. and the pullata series of Molokai. 



