352 ACHATINELLA CONCAVOSPIBA. 



late, glossy; whitish, ornamented with bands and narrow 

 streaks of coffee color. Spire concavely turrite, the apex 

 somewhat acute, white ; suture strongly margined. Whorls 

 7, the first three flat, following whorls convex, the last one 

 rounded, about equal to two-fifths the length. Columellar 

 fold superior, nodiform, white. Aperture oblique, reversed 

 auriform; peristome liver colored, the right margin a little 

 expanded, columellar margin very much dilated, reflexed, ad- 

 nate. Length 211/2, diam. HVs mm. Inhabits Sandwich 

 Islands, Dr. Frick, in Mus. Cuming' (P/r.). 



Palihua and Palihua iki, at the extreme southern end of the 

 Waianae range ; the form tur'biniformis in Lihue and on the 

 Popouwela division ridge. 



Achatinella concavospira PFR., Proc. Zool. Soc. Lond., 1859, 

 p. 30; Monographia, vi, p. 169. Apex tur'biniformis GULICK, 

 P. Z. S., Lond., 1873, p. 81, pi. 10, f. 7. 



A. concavospira with its several races is always dextral, so 

 far as we know, thereby differing from A. m. lymaniana of the 

 same district, which is invariably sinistral. Where A. c. tur- 

 'biniformis occurs in the same colony with A. m. bicolor on the 

 Popouwela-Lihue division ridge, there are no intergrading spe- 

 cimens (cf. no. 646, 647 coll. Spalding). It appears that 

 where concavospira forms occur with various subspecies of 

 mustelina, the two retain fully the proper shape, size and 

 color of their respective species, and the inference may be 

 drawn that they do not hybridize, at least ordinarily. My at- 

 tention was not specially directed to this point when studying 

 the Honolulu collections, but the material I brought home and 

 possess from the Gulick collection leads me to segregate con- 

 cavospira specifically. 



The type-specimen of A. concavospira as represented in pi. 

 52, fig. 16, which I owe to the kindness of Mr. E. A. Smith, 

 and typical shells such as Mr. W. D. Wilder collected in Pali- 

 hua at about 3,000 ft. elevation, pi. 62, figs. 24, 25, is a strik- 

 ingly distinct form, differing from A. mustelina. by its very 

 concave-sided slender spire and the short, swollen, last whorl. 

 The 3% embryonic whorls are flattened, white or a little fleshy 

 towards the tip. Subsequent whorls a little over three, the 



