AMASTRA, MAUI. 285 



a 1 . Diameter of shell less than half its length. 



&. Embryonic whorls carinate above the suture, 14. 7x 

 6.2 mm, ; Hawaii. A. sinistrorsa, no. 104. 



& 1 . Embryonic whorls not carinate. 



c. Rather large species, 15-25 mm. long; coarsely 



wrinkle-striate ; whorls 7 to 7^. 

 d. Maui, 15x7 to 24.5x7.3 mm. 



A. hutchinsonii, no. 89. 



d 1 . Molokai, 20x7 mm. A. h. villosa, no. 89. 



d 2 . Wider, 19x9 mm. ; Maui. A. farcimen, no. 90. 

 c 1 . Smaller shells, with finer or weak sculpture. 

 d. Shell finely striate. 



e. Brown; 7 whorls; Oahu. 



A. elongata, no. 54. 



e 1 . Spire brown, last whorl paler; 5-6 whorls; 

 Maui. A. lava, no. 88. 



d 1 . Weakly wrinkled; 11.5x5.5 mm.; Molokai. 



A. perversa, no. 82. 



d 2 . Weakly wrinkle-striate; spire brown, last 

 whorl lighter; Maui. A. soror, no. 86. 



86. A. SOROR (Newcomb). PI. 48, figs. 1-5. 



" Shell sinistral, conically-turrited ; whorls 7, rounded; 

 suture deeply impressed ; aperture subovate, small ; lip simple ; 

 columella very short, terminating in a twisted plicate tooth; 

 epidermis thin, dark corneous above and light corneous 

 below. Length 12, diarn. five-twentieths of an inch. 



' ' Var. a. Last whorl white, shell solid. Length 9, breadth 

 five-twentieths of an inch. 



" Var. &. Shell thin, dark corneous, polished. Length, 10, 

 diam. four-twentieths of an inch. 



" This species is the complete analogue of A. acuta [i. e., 

 A. elongata] found in Oahu ; it has a more ventricose aspect, 

 and the striae are more developed in the A. acuta ' (New- 

 conib) . 



Maui (Newc.) ; Lahaina, W. Maui (Gulick coll.). 



Achatinella soror NEWC., P. Z. S., 1853, p. 143, pi. 23, f. 38 

 [also fig. 36] (1854). PFR., Monogr., iv, 548. Amastra 

 soror PSE., P. Z. S., 1869, 650. 



