188 AMASTRA, OAHU. 



"Waianae (C. M. Cooke); Waianae (Baldwin). Go-types in 

 coll. Newcomb and British Museum. 



Achatinella cornea NEWC., P. Z. S., 1853, p. 141, pi. 23, f. 

 32. Amastra c., SYKES, Fauna Hawaiiensis, p. 335. 



This rather thin shell has the concavely tapering spire and 

 somewhat bulbous last whorl of A. crassilabrum. The convex 

 embryonic 2y 2 whorls show an elegant sculpture of extremely 

 fine, sharp and close longitudinal striae. The later and last 

 whorls are rather lightly marked with growth-wrinkles, but 

 are not malleated as A. crassilabrum usually is. The cuticle 

 is rather glossy, with no dull outer layer. Color brown or 

 slightly reddish-brown, sometimes having a yellow border be- 

 low the last turn of the suture. Newcomb 's figure, as well as 

 specimens from him we have seen, show that he was rather 

 wide of the mark in calling this species "corneous." The lip 

 has only a thin callous rim within, and the parietal callus is 

 also thin. Some shells are rather openly perforate, others 

 being imperforate. Length 13, diam. 7, aperture 5.9 mm. ; 

 6% whorls. The smallest adult seen is 11 mm. long. 



In a series from Waianae (Baldwin) the last whorl in old 

 shells is light yellow with some brownish streaks; the penul- 

 timate whorl has a yellow subsutural line, the spire being 

 otherwise rather dark brown. The aperture has the thin lip 

 of cornea, with hardly any internal callous rim. Specimens 

 measure : 



Length 17.5, diam. 8.5 mm. ; whorls 7 1 /. 



Fig. 14. Length 17.5, diam. 8 mm. ; whorls 7%. 



Fig. 13. Length 16, diam. 7.9 mm. ; whorls 7. 



An embryo from one of this lot (pi. 31, fig. 12) is long, 

 rimate, with the periphery merely subangular, and the colu- 

 mellar fold very weak and oblique. 



The shells from Kaala in C. M. Cooke collection are uni- 

 form dark red-brown, typical in shape. 



A lot of three shells from Waia.nae in the Cooke coll. have 

 the spire very light brown, last whorl light olivaceous-yellow- 

 ish. One of these is figured, pi. 31, fig. 10. 



