230 AMASTRA, OAHU. 



The embryonic shell of 2% whorls is rather high and conic, 

 purplish-red, darker at the tip, or rarely pallid. It is very 

 finely and closely striate. Subsequent whorls have low wrin^ 

 kle sculpture, strongest just below the sutures. The last 

 whorl retains the thin, light olivaceous-brown cuticle in shreds. 

 In adult shells it is entirely worn away in front of the aper- 

 ture, and is generally darker, brown-streaked, behind the lip. 

 The color below the outer layer of cuticle is pale brown. In- 

 terior white or faintly pink. The periphery remains acutely 

 angular up to the 5 to 5 l / 2 whorl stage, then becoming rounded. 

 There is an axial crevice behind the columellar lip. The 

 "columella subbiplicata" mentioned by Pfeiffer is an occa- 

 sional but inconstant feature, well developed in some shells, 

 such as that drawn in fig. 5, but the upper fold is quite in- 

 distinct or wholly wanting in most individuals. The lip is 

 thin-edged, and generally has a yellowish border within. 



Length 17, diam. 8.8, aperture 7.25 mm. ; 7 whorls. 



Length 17.2, diam. 8, aperture 7 mm. ; 7 whorls. 



Figures 1, 2 are copied from Pfeiffer; figs. 3, 4, 5 and the 

 above notes are from specimens from Mokuleia. 



Section HETERAMASTRA Pilsbry (p. 141). 



The single alleged Oahuan species referred to this group 

 may prove to be a sinistral Paramastra, near A. tenuispira 

 Baldwin, or perhaps it is not really from Oahu. 



54. A. ELONGATA (Newcomb). 



Shell sinistral, acutely turreted, with numerous well-defined 

 longitudinal striae, covered with a brown epidermis. Whorls 

 7, rounded ; suture deep, simple. Aperture ovate ; columella 

 plicate; lip simple. Length 0.5. breadth 0.22 inch. Oahu 

 (Newcomb, A. eloiigala}. 



Shell acutely turreted, sinistral ; whorls 7, rounded ; suture 

 deep ; striae numerous, longitudinal and well defined ; aper- 

 ture ovate; lip simple; columella plicate; color of epidermis 

 brown. But a solitary specimen of this shell has been found; 

 but its characters are clearly marked, and no described species 



