48 AMASTRA. 



A. SUBSOROR H. & P. PL 3, fig. 13. 



Vol. XXI, p. 287. The exact locality of this species is 

 not known. Two of the three lots seen are without habitat, 

 the other lot being labeled Lahaina, Maui, by Gulick. The 

 summit of one of the type lot is figured on pi. 3. 



A. subsoror auwahiensis P. & C., n. subsp. PI. 5, figs. 8, 9, 10. 



The shell is sinistral, imperforate, thin, ovate-turrite, chest- 

 nut-brown, the cuticle becoming yellowish on the spire in old 

 shells; lusterless, irregularly striate and having occasional 

 rather prominent wrinkles. Sculpture of the embryo fine, 

 close and delicate (too coarse in fig. 10). The last whorl is 

 swollen. Outer lip fragile. Columellar fold small and very 

 oblique. 



Length 11.1, diam. 6.25, aperture 5.25 mm. ; 5% whorls. 



Length 12, diam. 6.25, aperture 5.3 mm. ; 6 whorls. 



East Maui : Auwahi, at 4200 ft., very abundant. 



Differs from subsoror chiefly by its more robust contour, 

 the last whorl being more swollen, and the shell larger in 

 every way. The sculpture of the apex is about the same. It 

 was found in fine dirt around and under rocks or occasion- 

 ally attached to them. 



Auwahi is on the slope of Haleakala facing Hawaii, just 

 above Ulupalakua. 



Hitherto A. Iczva and A. hutchinsonii were the only Heter- 

 amastras known from East Maui; but Mr. Thaanum's find 

 shows that the group of forms supposed to be West Mauian 

 is also represented in the east. Curiously enough, they were 

 found in the southern slope, and not on the less remote Kula 

 side. 



A. NUBIGENA Pils. & Cooke, n. sp. PI. 5, figs. 11, 12; pi. 3, 

 fig. 15. 



The shell is imperforate, sinistral, solid but rather thin, 

 ovate-turrite, dark chocolate-colored, pale around the colu- 

 mella. Surface matt except in front of the aperture, where 

 the very thin outer cuticle is worn off. Outlines of spire 

 slightly concave above. Apex rather acute, the initial half 



