AMASTRA. 19 



a very pretty small form of the race was found. It was from 

 more open country, at the upper edge of the forest. 



Length 9, diain. 7 mm.; 5% whorls (largest). 



Length 8, diam. 6 mm. ; 5 whorls. 



Auwahi is two miles or a little more from Polipoli, a grassy 

 ridge separating the two localities, which are on the great 

 ridge running southwest from Haleakala. 



A. obesa of normal size, with the aperture white, was taken 

 by Mr. Thaanum in the Polipoli Forest Eeserve, Kula, at 4300 

 ft. elevation. It is very rare there, only about a dozen living 

 shells found in two days. They measure from length 11.5, 

 diam. 9rnm. to 11 x 8% mm. Even the living ones have the 

 cuticle partially deciduous. An embryo is figured, pi. 4, 

 fig. 13. 



A. METAMORPHA P. & C., n. Sp. PL 5, figs. 1 to 5. 



The shell is perforate, dextral, long conic, rather thin; 

 russet, the last whorl usually light brownish olive or Isabella 

 color, and white under the cuticle in adults. Spire straightly 

 conic, the whorls convex. Embryonic whorls convex, worn 

 in adults, but in the young they are very minutely and deli- 

 cately striate (fig. 5). Later whorls are lusterless, with 

 sculpture of indistinct, irregular growth-lines, the last whorl 

 usually having a few coarse wrinkles. The aperture is small, 

 with a rather thick white lining in adult shells; outer lip 

 acute, dark-edged, not thickened within. Columellar lamella 

 small and oblique. 



Length 12.25, diam. 6, aperture 5 mm. ; G 1 /^ whorls. 



Length 11.25, diam. 5.5, aperture 4.7 mm. ; 6 whorls. 



Length 10.5, diam. 6.3, aperture 4.9 mm. ; 5% whorls. 



West Maui: Olowalu Gulch, D. Thaanum. Cotypes in 

 A. N. S. P. and Bishop Mus., also in Thaanum coll. 



This interesting Amastra was found by Mr. Thaanum in 

 July, 1913. It is isolated among Mauian species, and appears 

 to be an elongated form of Cyclamastra, related remotely 

 to obesa and agglutinans. There is a certain resemblance to 

 the Hawaiian group of A. melanosis, which like A. meta- 

 morpha has affinities with both Amastrella and Cyclamastra. 



