1888.] NATURAL SCIENCES OF PHILADELPHIA. 251 



Partula albescens, Nobis. PI. XIII, fig. 4. 



Shell dextral, ovate elongate, spire acute, regularly tapering, 

 equal to one half the length, whorls 5, rounded. Suture impressed, 

 body whorl somewhat inflated, spiral strige numerous, regular and 

 very fine, umbilicus open, aperture ovate, oblique, peritreme connect- 

 ed by a thin callus, columella wide at base, lip white, expanded, 

 and concave, color a clear white and translucent. 



L. 25. Diam. 13. L. apt. 8. Diam. apt. 5. 



Hab. Aura and Satova Islands, N. Hebrides, E. L. Layard, Esq. 



Ohs. A pretty species, resembling Partula alahastrina Pfr. 



from Figii Isles, except that it is larger and the spire is more acute. 



Trochomorpha rubens, Xobis. PI. XIII, figs. 5, 5a, 5b. 



Shell sub-lenticular, translucent, convex above, whorls 5, acutely 

 carinate, compressed, planulate, lightly striate beneath the suture, 

 which is margined by the acute carina, base convex, Avith very fine 

 transverse strise, umbilicus large, perspective one fifth the diameter 

 of the shell, aperture oblique, diagonal, peritreme simple, except near 

 the base, color reddish brown, with a darker revolving line at the 

 periphery, visible within the aperture, and extending to the apex. 



H. 5. Diam. 15. H. apt. 2*. Diam. apt. 6 mill. 



Hab. Aura Islands, N. Hebrides. 



Ohs. Mr. Layard observes, " this shell has a general range 

 throughout the N. Hebrides," it differs from all others with which 

 I am acquainted. T. planorhis is thinner, more translucent, and 

 more depressed, with a wider umbilicus exhibiting the whorls to the 

 apex. 



Helicina Layardi, Nobis. PI. XIII, figs. 6, Ga. 



Shell dextral, orbiculate, thin, spire convex, whorls 4, compressed, 

 the first one and a half foveate, with thin indistinct elevated spiral 

 strise, the remainder transversely and finely striate, suture distinct, 

 umbilical region covered by an elevated vitreous callosity which is 

 foveate, aperture triangularly lunate, peristome slightly revolute, 

 moderately thickened, emarginate at base, color pale lemon yellow, 

 with two blood-red bands, one above, the other beneath the periph- 

 ery, and visible within the apertui-e. 



H. 4i. Diam. 7. H. apt. 3]. Diam. apt. 2 mill. 



Hab. Aura Islands, New Hebrides, E. L. Layard. 



Obs. Resembles H. jyrimeana Gass. from New Caledonia. 



