202 



AMASTRA, OAHU. 



Wahiawa, type loc., and Ahonui (Gulick) ; Kahana (C. M. 

 Gooke) ; a variety at Kawailoa (Gulick). 



Achatinella inflata PFR., P. Z. S., 1855, p. 203 (Feb., 1856) ; 

 Monogr., iv, 549. BALDWIN, Catalogue, 1893, p. 9. 



This species is known to me by numerous specimens from 

 Wahiawa, Ahonui and Kahana. In the Wahiawa lot (pi. 33, 

 figis. 1-3), which I consider typical, the shape varies rather 

 widely, as shown in the figures. The embryonic whorls are 

 nearly smooth, being marked 'with fine growth-striae only, as 

 in A. decorticata. The wrinkles of the later whorls are rather 

 coarse and irregular, and a few spiral lines cut them in occa- 

 sional individuals. The color is rich chestnut with a sugges- 

 tion of orange, over which there is a very thin outer layer of 

 darker, almost -chocolate-brown, more or less worn from the 

 wrinkles and wanting below the periphery in front of the 

 aperture. Behind the lip it is much darker, deep chocolate 

 or blackish. Often a peripheral darker belt may be seen. 

 The denuded subsutural belt mentioned by Pfeiffer is seen in 

 some dead shells of the Wahiawa lot, and in a few living ones. 

 Under the colored cuticle the shell-substance is fleshy-whitish 

 in the last whorl, but generally darker above it, so that the 

 spire is purplish-brown. Immature shells are very ventricose 

 and have a rather sharp peripheral angle which persists up 

 to the end of the fifth whorl. The last two whorls are much 

 swollen below the suture, or rarely this swelling is beMed, 

 appearing as late as the last half of the last whorl. Nearly 

 all the shells are imperforate when mature, but the young 

 may remain perforate up to about 10 mm. long, 4^ to 5 

 whorls. Specimens measure : 



Length 18, diam, 10, aperture 8 mm. ; whorls 6%. 



Length 16.2, diam. 9.9, aperture 8 mm. ; whorls 6. 



Length 17, diam. 9.2, aperture 7.9 mm. 



Length 15, diam. 9.9, aperture 8.3 mm. 



Length 16.8, diam. 9, aperture 8 mm. 



In Pr. C coke's series from Kahana, on the north side of 

 the range, the inflation of the later whorls is minimiized, the 

 sculpture less rough, and the color generally somewhat lighter. 

 None of the shells, are so inflated as the more obese forms 

 from Wahiawa, 



