AMASTRA, MOLOKAI. 257 



Series of A. magna (p. 237). 



Large Amastrae with the embryonic whorls varying from 

 costate and carinate to finely striate without visible keel ; 

 later whorls having the thin cuticle mottled or zigzag-striped, 

 sometimes almost wholly deciduous. 



Related to the much smaller shells of the assimilis group. 



69. A. VIOLACEA (Newcomb). PI. 27, figs. 3, 4. 



Shell dextral, ovate-oblong, solid ; whorls 7, convex, strongly 

 striate longitudinally; suture plain and deeply impressed. 

 Aperture ovate ; columella. short, terminating in a twisted 

 plait ; lip simple, 'color violaceous with light colored striae. 

 Length 1.1, diam. .55 inch [27.9x14 mm.] (Newc.). 



Molokai: (Newc.) ; Mapulehu to Halawa (Baldwin) ; Hal- 

 awa and I*elekunu (Perkins) ; Pelekunu, Mapulehu and Hal- 

 awa, a ground shell (Meyer) ; all in the eastern end of the 

 island. 



Achatinella violacea NEWC., Ann. Lye. Nat. Hist, of N. Y., 

 vi, May, 1853, p. 18; P. Z. S., Land., 1853 [1854], p. 135, pi. 

 22, f. 14. THWING, Orig. Descriptions, p. 164, pi. 3, f. 23.- 

 PFR., Monogr., iv, 543. Amastra v., SYKES, Fauna Hawaiien- 

 sis, p. 347. BORCHERDING, Zoologica, xix, p. 105, pi. 10, f. 1. 

 GULICK, Evolution, Racial and Habitudinal, pi. 1, f. 18. 



A. violacea differs constantly from A. magna of Lanai by 

 finer sculpture of the 'embryonic shell, which never shows 

 the peripheral carina above the suture, and in having a thin 

 parietal callus. We do not agree with Borcherding in unit- 

 ing them specifically. 



Fig. 3 represents a specimen in all respects typical, from 

 Halawa, collected by Thaanum. This may be considered type 

 locality. The shell is imperf orate. This typical form is well 

 described as violaceous with light striae, the apex being pur- 

 plish and the earliest neanic whorls yellowish, interior purple. 

 Sometimes the surface is more worn, and of a nearly uniform 

 flesh tint, the apex nearly white. Small fragments of the thin 

 brown cuticle remain, and when sufficiently preserved on the 

 spire it is seen to have irregular dark figures and lighter 

 ground, showing relationship to A. mibilosa. The embryonic 



