AMASTRA, HAWAII. 315 



108. A. FOSSILIS Baldwin. PI. 47, fig. 10. 



; ' Shell fossil, dextral, minutely perforated, somewhat solid ; 

 elongately conical, apex rather acute; surface striated with 

 somewhat irregular growth-lines ; embryonic whorls under a 

 lens exhibiting very delicate and regular sulcations. Color 

 of living shell unknown. Whorls 7, slightly convex. Aper- 

 ture oblique, ovate; peristome simple, very thin, columellar 

 margin slightly expanded over the umbilicus; columella ter- 

 minating in a flexuous thread-like plait. Length 18, diam. 9 

 mm." (Baldwin). 



Hawaii : Palihoukapapa, 4 miles from Mana, on the Hama- 

 kua slope of Mauna Kea, elevation about 4000 ft., fossil in a 

 deposit about a foot below the surface (Eugene Horner). 



Amastra fossilis BALDWIN, Nautilus, xvii, July, 1903, p. 

 35. HENSHAW, Journal of Malacology, xi, p. 63. 



One of the types from the Baldwin collection is figured. 

 The shell differs from A. conica by being wider below, more 

 turrited, resembling some wide forms of A. turritella in con- 

 tour. It is moreover somewhat malleate, in some examples. 

 The embryonic whorls are worn, so that their sculpture is 

 lost. Later whorls are rather convex and have rather coarse 

 growth- wrinkles, and in the larger shell some irregular mal- 

 leation on the last whorl. The columellar fold is small and 

 oblique, and the axial perforation rather large and open. 



Fig. 10. Length 17.21, diam. 9, aperture 7.25 mm.; 6y 3 

 whorls. 



Length 15.3, diam. 9, aperture 6.9 mm. ; 6 whorls. 



This form may turn out to inter grade with A. conica. 



Series of A. flavescens. 



This series contains but two well-defined species, which are 

 very close to typical Amastrella conchologically. Probably 

 A. luteola, Fer. (species no. 113) may prove to be a slender 

 form of this series. It is to be looked for in northwestern 

 Hawaii. 



109. A. FLAVESCENS (Newcomb). PI. 47, figs. 12, 13, 14, 17. 

 " Shell dextral, conical; whorls 6, slightly rounded; suture 



