AMASTRA, HAWAII. 317 



109a. Var. saxicola Baldwin. PI. 47, figs. 11, 16. 



A. saxicola Baldwin does not seem specifically separable 

 from A. flavescens. Four specimens of the type lot from 

 Baldwin's collection are before us, are a very light pinkish- 

 brown tint, with the thin lip edged with pink within, fading 

 inward. One of these is figured, fig. 16. 



Length 17, diarn. 9.2, aperture 7.5 mm. ; 6y 2 whorls. 



Length 16.9, diam. 9.2, aperture 7.3 mm. ; 6% whorls. 



Length 16, diam. 9, aperture 7.2 mm. 



The dimensions given by Baldwin were evidently taken 

 from a much more oblong shell than those sent for figuring, 

 but one of a set of 10 shells from H. W. Henshaw (no. 172937, 

 U. S. Nat, Mus.) has the same ratio of diam. to length. Others 

 agree with those from Baldwin, extreme examples measuring: 



Fig. 11. Length 18, diam. 9, aperture 8 mm. ; whorls Qy 2 . 



Length 15.3, diam. 9, aperture 7.2 mm. ; whorls 6. 



This lot is labeled: A. A. flow, Kahuku ranch, Kau, 2400 

 ft. alt. 



Baldwin's description follows: 



"Amastra saxicola n. sp. Shell dextral, imperforate, rather 

 solid, elongately ovate-conic, apex subacute; surface lustre- 

 less, sculptured with delicate growth-lines ; embryonic whorls 

 smooth and polished. Color reddish-brown, tending to lighter 

 shade on the middle whorls ; apex pearly white ; destitute of 

 the usual fugacious epidermis of this genus. Whorls 7, 

 slightly convex; suture well-impressed. Aperture ovate, a 

 little oblique, pinkish within. Peristome simple, acute, not 

 thickened within, extremities joined by a very thin, pinkish 

 parietal callosity ; columella white ; flexuous, terminating in a 

 moderately-developed lamellar plait. Length 20%, diam. 10 

 mm. Habitat : Kau, Island of Hawaii. 



This shell seems to live among and under rocks to an un- 

 usual degree. It is found on old lava flows attached to the 

 under side of rocks, or in loose soil and trash at the base of 

 bunch grass growing on lava flows. The locality is very 

 arid " (Baldwin). 



