AMASTRA, LANAI. 245 



lated species. It differs chiefly in being smaller and more 

 slender than biplicata. 



63. A. DURANDI Ancey. PL 39, figs. 7, 9, 10. 



" Shell imperf orate or nearly perforate, conoid-oblong, 

 solid ; fleshy- whitish under a black-brown epidermis which is 

 partly deciduous, and sometimes lightning-streaked above; 

 somewhat glossy, lightly striate, the apex nude, blackish- 

 purple. Spire conic-turrite, acute. Whorls 7, the first 

 sharply and closely striate, nearly flat, those following con- 

 vex, parted by a narrow and simple suture, the last whorl ob- 

 long, rotund. Aperture suboblique, sinuate-semioval, angular 

 above; parietal wall and columella glossy reddish, the rest 

 concolored, interior pale rose-white. Columella provided 

 above with two oblique, acute and equal folds. Peristome 

 acute. Length 15.5, diam. 8, alt. apert. 6 mm." (Anc.) 



Lanai (Pease, in U. S. Nat. Mus. ; Cooke coll.) 



[Waianae, Oahu, E. Durand.] 



Amastra durandi ANCEY, Le Naturaliste, xix, 1897, p. 178. 



" This interesting species is incontestably closely related 

 to A. biplicata of the island of Lanai, and may be considered 

 a derivative form of that which has had an independent de- 

 velopment on another island. It is remarkable for the two 

 quite equal cokimellar folds, while in its congener they are 

 slightly unequal, a size smaller than A. biplicata, and a more 

 brightly colored aperture " (Ancey). 



Mr. Ancey 's description and remarks are given above. The 

 locality given by him was undoubtedly erroneous. Eight 

 specimens of the species from Lanai are before me: one 

 from the National Museum, no. 42408&, three from the Cooke 

 collection, no. 2230, and four from the Boston Society, nos. 

 13432 and 13434. In having finely striate dark-purplish em- 

 bryonic whorls it is like A. mcesta. The very shallow pro- 

 tractive depressions, retaining dark cuticle on the interme- 

 diate whorls of some specimens are also found in mcesta and 

 biplicata. The columella is like that of A. biplicata. The 

 two folds may be subequal, or the upper one may be wider or 

 more oblique. There is sometimes a heavy callus within the 



