178 AMASTRA, OAHU. 



23. A. SOLID A Pease. 



"Shell dextral, imperf orate, thick, long-ovate, whorls 6, 

 convex, the last feebly inflated, more rarely rounded-angulate 

 at the base, not quite half the length of the shell. Aperture 

 broadly elliptical, subangular at the base. Columellar fold 

 thick, subbasal, nearly transverse. Peristome rugose, cal- 

 loused, the margins joined by a thick callus. Chestnut-brown, 

 the apex red-brown, aperture whitish. Length 15, diam. 8 

 mm. 



"The peculiar callous deposit around the aperture distin- 

 guishes this species from its congeners" (Pease). 



Oahu (Pease). Type in Pease coll., Mus. Comp. Zoology. 



Amastra solida PSE., Journ. de Conchyl., 1869, p. 173. 



An unfigured species of uncertain systematic position, not 

 seen by us, and equally unknown to other authors. 



24. A.VETUSTA Baldwin. PI. 29, figs. 16, 17. 



The shell is minutely rimate, oblong-conic, rather thick and 

 solid. Being known from fossil examples only, it is whitish 

 and without cuticle. Spire slightly conic, a little contracted 

 towards the subacute apex. Whorls 61/3, but slightly convex. 

 First half-whorl smooth; next two whorls of the embryonic 

 shell are sculptured with fine, deeply engraved, slightly 

 arched longitudinal striae. Subsequent whorls rudely sculp- 

 tured with rather coarse, strong and close longitudinal wrin- 

 kles, which are cut by a few irregularly placed spiral lines, as 

 if scratched on a soft surface. The aperture is hardly ob- 

 lique, small, ovate. Outer lip is obtuse, strongly thickened 

 within. Columelk bears <a subhorizontal lamella, rather small 

 in front view, but very strong within, as seen in an oblique 

 view in the mouth. The parietal callus is heavy, especially 

 at the edge. 



Length 13.3, diam. 8 mm. ; length of aperture with peri- 

 tome 61/2 mm. 



Length 14, diaon. 8 mm. ; aperture 6y 2 mm. 



Oahu : Fossil at Punchbowl Hill, Honolulu. 



Amastra vetusta BALDWIN, Proc. A. N. S. Phila., 1895, p. 

 233, pi. 11, f. 50. 



