AMASTRA, OAHU. 201 



evenly striate. Subsequent whorls have rather coarse, very 

 low, uneven wrinkles, the surface being rougher and much 

 less glossy than in A. textilis. The outlines of the spire con- 

 tract a little near the summit, but the penultimate' whorl, 

 especially when viewed from the back, bulges noticeably. The 

 axis is generally perforated, but in some narrow shells the 

 crevice is nearly or quite closed. In a. few old individuals 

 there is a white callous nodule on the parietal wall, which is 

 thinly covered with a sii'b transparent or dirty- white film, thin 

 at the outer edge. Specimens from Kawailoa (pi. 33, figs. 

 4-7) measure: 



Length 16.4, diam. 9, aperture 7.2 mm. ; whorls 6. 



Length 15.2, diam. 8.8, aperture 7.8 mm. ; whorls S 1 /^. 



Length 16, diam. 8, aperture 6 mm. ; whorls 6. 



Length 15, diam. 9, aperture 7.5 mm. ; whorls 5%. 



Some of the shells from Kahana, at the eastern limit of dis- 

 tribution of the species, have a thin outer layer of dull, red- 

 disk cuticle, almost continuous over the last two wliorls except 

 in front of the aperture, darker as usual on the latter part 

 of the whorl ; but owing to the similarity of the outer to the 

 inner cuticle in color (the former more of a reddish, the latter 

 more yellowish, tone), it is quite inconspicuous unless looked 

 for very closely. These more fully clothed shells form an 

 approach to A. rubicunda which occupies the eastern end of 

 the range, though of course decorticata is always shorter, and 

 abundantly distinct specifically. 



40. A. INFLATA (Pfeiffer). PI. 33, figs. 1, 2, 3. 



"Shell imperf orate, conic-globose, rather roughly striate; 

 whitish, covered with a black epidermis worn off in a wide 

 band below the suture. Spire swollen, terminating in a short, 

 acute cone. Whorls 5y 2 , the last three very turgid, the last 

 about as long as the spire. Aperture oblique, sinuate-oval. 

 White within. Columellar fold subtransverse, ascending 

 highly. Peristome unexpanded, labiate within; columellar 

 margin callous, dilated, adna.te. Length 16.5, diam. 10, aper- 

 ture 8.5x5 mm." (P/V.). 



Oahu (Frick, in Cuming coll.) ; Koolaulo'a (Baldwin) ; 



