AMASTRA, OAHU. 227 



"The peculiar color of the aperture and the rugose, very 

 peculiar epidermis with which the animal covers its shell dis- 

 tinguishes this species well from its congeners" (Pease). 



Oahu (Pease) : central portion of the main range at Wahi- 

 awa (Gulick) ; Kahana (C. M. Cooke, Jr.). 



Amastra porphyrostoma PEASE, Journal de Conehyliologie, 

 xvii, 1869, p. 172 ; P. Z. S., 1869, p. 649.Achatinella p., PFR., 

 Monogr., viii, p. 233. HABTMAN, Proc. A. N. S. Phila., 1888, 

 p. 48, pi. 1, f. 6. 



Fig. 12 represents a specimen from the Pease collection. 

 Those ta.ken by Gulick in Wahiawa valley are typical. The 

 internal border of the outer lip, the columella and parietal 

 callus are of a fine though not very deep purple color. The 

 apical whorls are brown, or sometimes purple-brown with a 

 pale band at the top. The "rugose-brown epidermis" men- 

 tioned by Pease is foreign matter plastered on after the man- 

 ner of Pterodiscus, etc. The real cuticle is thin, smooth, and 

 of a light yellowish-chestnut color, the calcareous layer below 

 being pale fleshy-yellowish. The axis is often perforate. The 

 second embryonic whorl is very finely striate, as in A. turri- 

 tella, etc. 



The shells from Kahana valley, on the north side of the 

 range, have but little purple color within the outer lip, and 

 the parietal callus is of a rather dull brownish purple. The 

 shredded cuticle is of a dull, cold, brown color (pi. 37, figs. 

 8,13). 



Length 20.2, diam. 12, aperture 10 mm. ; whorls 6. 



Length 21, diam. 12, aperture 10.5 mm. ; whorls 6. 



Length 17.8, diam. 11.2, aperture 10 ; whorls 5y 2 . 



This species is somewhat related to A. porphyrea, but it 

 differs from all other related species by the colored parietal 

 callus. 



52. A. CYLINDRICA (Newcomb). PI. 34, figs. 13, 14, 16. 



"Shell dextral, elongately cylindrical, tapering to a point 

 at the summit. Whorls 7, slightly rounded ; suture moderate. 

 Aperture oblong-ovate; columella terminating in a flexuous 

 tooth. Surface of shell longitudinally strongly striate, of a 



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