226 AMASTRA, OAHU. 



light lines on a dark ground give this form a peculiar and 

 distinct appearance. The dimensions and proportions vary 

 rather widely : 



Length 16.8, diami. 11 mm. 



Length 19.2, diam. 11 mm. 



Length 17.2, diam. 10 mm. 



Another lot from Kahana, Oooke coll., contains fleshy-brown 

 shells with a partly deciduous dark brown cuticle, spirally 

 banded and lineate shells, and one pa.le buff throughout. This 

 lot is less roughly striate than the preceding, being very much 

 like the forms from the Waianae range. The locality "Ma- 

 noa" given by Hartman is evidently an error. 



Ackatinella grossa Pfr. is identical with porphyrea accord- 

 ing to Newcomb, an opinion which later authors have ap- 

 proved. The description follows : 



"Shell imperf orate, dextral, conic-ovate, solid, somewhat 

 roughly striate, chestnut-colored. Spire ovate-conic, the apex 

 acute, blackish, suture pale, crenulate. Whorls 7, the upper 

 ones flat, smooth, the following gradually becoming more 

 convex ; last whorl about two-fifths the total length. Aper- 

 ture oblique, sinua.te-semioval, whitish inside; columellar fold 

 laminiform; subtriangular, nearly transverse; peristome uu- 

 expanded, a'cute, the margins joined by a whitish callus, right 

 margin somewhat labiate within, columellar margin adnate. 

 Length 23, diam. 11, aperture 10x5 mm. Sandwich Islands, 

 Frick in Cumin g coll." (Pfr.) . 



51. A. PORPHYROSTOMA Pease. PI. 37, figs. 8, 12, 13. 



"Shell dextral, imperf orate, thick, long-conic, marked with 

 fine rough strias, covered with a very thick, brown, rough epi- 

 dermis, below which there is a thin, smooth, brown one. Spire 

 convexly conic. Whorls 6, convex, the last convex, half the 

 total length ; suture well marked. Aperture subelliptical, sub- 

 angula.r at the base. Columella narrow, vertical : columellar 

 fold thick, lamellifornij, nearly transverse. Outer margin 

 simple. Ground-color of the shell under the epidermis yel- 

 lowish. Columella and outer lip of a purple tone; summit 

 reddish-brown. Length 20, diam. 11 mm. 



