VIII. 



Section AMASTRA— H. & A. Adams. 



/. Shells from Oahu. A. — Main mountain ridge. 



235. Achatinella tristis Ferussac. 



A. tristis Fer. Rve. Conch. Icon. Achat., London, 1850, pi. v, fig. 37. 



Shell globosely ovate, rather solid, dextral, spire short, acute 

 at the apex, whorls convex, columella arched, with a twisted plait; 

 yellowish-cream color or brownish, covered with a black fugacious 

 epidermis, apex brown-red. 



Hab. Nuuanu to Palolo. — Bald. 



236. Achatinella fuliginosa Gould. 



A.fuliginosa Gld. P. Boston Soc, ii, 1848, p. 28. 



T. imperforata, ventricoso-ovata, apice acuta, tenui, pallide virescente, 

 epidermide nigricante induta; anfr. 6, supra subtabulatis, striis incrementi, 

 et striis volventibus inequalibus decussatis ; apertura parva, sernilunari; 

 latro siruplici intus incrassato, fauce cyerulescente; plica acuta. Long. 7-10, 

 lat. 2-5 poll. 



Shell imperforate, ventricose-ovate, apex acute, thin, pale 

 greenish, covered with a blackish epidermis; whorls 6, nearly flat, 

 unequally decussate with lines of growth and revolving striae; ap- 

 erture small, semilunate; lip simple, thickened within, aperture 

 bluish; fold acute. 



Hab. Nuuanu to Palolo. — Bald. 



This shell is generally placed with A. tristis Fer. 



237. Achatinella ventulus Ferussac. 



% A. ventulus Rve. Rve. Icon. Conch., London, 1850, pi. iv, fig. 31. 



Shell oblong, cylindrical, dextral, whorls flatly convex, very 

 finely impressed striated, columella short, arched, thinly twisted- 

 plaited; aperture small ; very dark brown, with a pale band be- 

 neath the sutures, covered with a slight epidermis, interior of aper- 

 ture bluish. 



(143) 



