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 irnperf 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 stria/te, 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 columellar 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. 42408a, 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 



