Original Descriptions of Acliatinella. 105 



167. Achatinella hayseldeni Baldwin. 



A. hayseldeni Bald. Nautilus, x, 1896, p. 31. 



Shell sinistral, minutely perforated, rather solid, ovately coni- 

 cal, apex subacute ; surface shining, marked with delicate incre- 

 mental striae, 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 color- 

 ing 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 5 1-2, slightly convex, narrowly margined 

 above, the last carinated or angulated at the periphery, the angle 

 becoming almost obsolete towards 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 ter- 

 minating in a strong, flexuous, white fold. Length 17 1-2, diam. 

 10 mm. 



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. — Bald. 



Hab. Lanaihale. — Perkins. 



4. East Main Shells. 



PORCELLANA GROUP. 

 168. Achatinella porcellana Newcomb. 



A. porcellana Newc. P. Zool. Soc. London, 1S53, p. 146, pi. xxiii, fig. 47. 



Shell rather solid, conical, polished, shining ; whorls 5, round- 

 ed, margined above; aperture ovate; lip exanded, thin at the 

 margin, thickened within ; columella short, tubercular ; colour of 

 a porcelain whiteness, with a light fawn-coloured band encircling 

 each whorl, the last whorl having two. Long. 12/20, lat. 6/20 poll. 



