THE NAUTILUS. 31 



DESCRIPTION OF TWO NEW SPECIES OF ACHATINELLIDJE 

 FROM THE HAWAIIAN ISLANDS. 



BY D. D. BALDWIN. 



Partulina Hayseldeni n. sp. 



Shell sinistral, minutely perforated, rather solid, ovately conical, 

 apex subacute ; surface shining, marked with delicate incremental 

 stria?, and under a lens exhibiting very close, minute, decussating 

 spiral lines ; embryonic whorls faintly cross-lined. Color generally 

 of a uniform reddish-brown ; sometimes the coloring of the middle 

 portion of the whorl shades into white on the apical whorls, and in 

 some examples a white line revolves below the suture. Whorls 5o, 

 slightly convex, narrowly margined above, the last carinated or 

 angulated at the periphery, the angle becoming almost obsolete to- 

 wards the aperture ; suture distinctly impressed and often margined 

 above by the continuation of the peripheral keel. Aperture oblique, 

 subovate, white within with a pinkish tinge ; peristome white, rather 

 obtuse, thickened within, the basal and columellar margins slightly 

 reflexed ; columella terminating in a strong, flexuous, white fold. 



Length 17i ; diani. 10 mm. 



Habitat, Island of Lanai. 



Animal when extended in motion longer than the shell. Mantle 

 slate color with a brown band encircling the outer edge. Foot above 

 and below almost white with a yellowish tinge. Tentacles white 

 tinged with slate. 



This species is allied to P. semicarinata Newc. which is found in 

 another district of the same island. The latter is a light straw- 

 colored, more conical, and invariably dextral shell. The animals of 

 the two species are somewhat similar, but sufficiently different to 

 warrant the separation. 



We take pleasure in dedicating this handsome shell to Mr. Walter 

 H. Hayselden, the young naturalist who discovered both it and the 

 following species. 

 Amastra aurostoma n. sp. 



Shell dextral, imperforate, solid, elongately ovate, spire conical, 

 apex subacute; surface lusterless, striated with somewhat irregular, 

 coarse growth stria?; the embryonic whorls finely, radiately sulcated. 

 Color light brown, apex dark chestnut ; the lower whorls covered 

 with a black, fugacious epidermis which is generally dense on the 

 last whorl and more sparsely distributed on the other 



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