AMASTRA, MAUI. 289 



win. The shell is rather solid; spire is a little contracted 

 above, embryonic whorls finely costellate as in A. hutchin- 

 sonii. The following whorls have sculpture of irregular 

 rather coarse wrinkles, and in some individuals there are dis- 

 tinct spiral striae. Usually an inconspicuous angle or keel 

 is visible just above the suture. The last whorl is yellow or 

 buff, with fragments of a very thin brown cuticle. On the 

 spire the tint darkens, becoming reddish-brown at the em- 

 bryonic whorls. Aperture white, the lip acute, somewhat 

 thickened within. Columellar lamella small, variable in size. 

 Length 11.5, diam. 5.4, aperture 4.7 mm. ; 5% whorls. 



In one specimen sent by Mr. Baldwin no trace of a colu- 

 mellar lamella is visible, the shell being normal otherwise 

 (pi. 48, fig. 15). In another shell, old and dead, the lamella 

 is very strongly developed (pi. 48, fig. 13). Length 12, 

 diam. 5.9, aperture 5 mm.; 6% whorls. 



A. lava stands intermediate between A. soror and A. hut- 

 chinsonii, having sculpture and cuticle like the latter, while 

 the shape of the spire is rather that of soror. Dr. Newcomb 

 sent out specimens of lava, under the name elongata. See p. 

 231. 



89. A. HUTcniNSONn (Pease). PI. 49, figs. 1, 2, 14. 



" Shell acuminately turrited, sinistral, imperforate. 

 Whorls 7, flatly convex, coarsely and irregularly striated lon- 

 gitudinally, not marginated. Sutures somewhat rude, well 

 impressed. Aperture ovate, about two-fifths the length of 

 the shell ; columellar fold slight, oblique and tortuous. Shell 

 covered with an earthy-brown epidermis; apex of a darker 

 color; aperture and columella white, shining. Maui, Sand- 

 wich Islands " (Pse.) 



East Maui: Makawao and Kula (Baldwin); Molokai: 

 Waialua (Borcherding). 



Helicter hutchinsonii PSE., P. Z. S., 1862, p. 7. Achatin- 

 ella h., PFB., Monogr., vi, 180. THWING, Orig. Descript., p. 

 177, pi. 3, f. 24. Amastra h., HARTMAN, Proc. A. N. S., 

 Phila., 1888, p. 45, pi. 1, f. 9. 



Molokai references. Amastra villosa SYKES, Proc. Malac. 



