206 MR. E. A. SMITH ON THE MOLLUSCA [May 6, 



whorl long, a little contracted behind the aperture, and marginate 

 beneath the suture near the lip. Aperture almost perpendicular, 

 somewhat ear-slnped, dirty whitish within, together with the peri- 

 stome equalling rather less than half the total length of the shell. 

 Lip somewhat flattened and expanded. Columellar margin re- 

 flexed, not twisted or tubercular ; outer margin above well bent over 

 towards the columella, with which it is united by a thin callus. 



Length 16-j millim., diam. 7; aperture 8 long, 5| broad. 



Hab. Wild Island and Pigeon Island. 



P. elongata, Pease, and P. gracilis of the same author, from the 

 Tahiti group, closely resemble this species. The former is rather 

 larger and broader, not so strongly spirally striated, and more or 

 less striped with pale brown. The latter has a longer aperture, 

 rather more convex apical whorls, and a peculiar bulging at the 

 lower part of the body-whorl. P. minuta, Pfr., also from the 

 Admiralty Islands, is similarly sculptured, but of a totally distinct 

 form. 



8. Cyclostoma infans. (Plate XXII. fig. 8.) 



Shell small, moderately umbilicated, thinnish, light brownish red, 

 more or less variegated and streaked with white above, turbinate- 

 conoid, obtusely angled at the periphery. Whorls 5, considerably 

 convex, divided by a deep suture ; upper ones rather more lightly 

 coloured than the last, faintly spirally striated ; last whorl crossed 

 by oblique lines of growth, encircled above the middle by about ten 

 thread-like lirse, with the lower part rather more finely lirate, 

 scarcely at all descending in front. Aperture subcircular, brown 

 within, with a pale narrow band at the periphery. Peristome thin 

 and scarcely expanded on the outer margin, a little thickened at 

 the base of the columella, which has the free edge somewhat sinu- 

 ated. Columella and upper extremity of the outer lip united by a 

 thin glossy callus. 



Greatest diameter 5| millim., smallest A\, height 6. 



Operculum shelly, white, slightly concave, consisting of four 

 whorls, exhibiting a few spiral stria? and a central nucleus. 



Hab. Wild Island. 



This species appears to be closely related to CycJotus poirierii, 

 of Tapparone-Canefri, from the southern part of New Guinea. It 

 is a little smaller, has a whorl less, and the peristome is not double 

 as in that species. Cyclostoma pygmeum, from New Ireland, is of 

 a different form, has stronger sculpture on the base of the body- 

 whorl, and a different columeliar margin. 



9. Helicina ponsonbyi. (Plate XXII. figs. 9, 9 a.) 



Shell small, globose-conical, uniformly yellow, or sometimes with 

 a reddish band around the lower part of the upper whorls, which 

 becomes paler upon the last, and is situated just above the peri- 

 phery. Volutions A\, a little convex ; the last rather globose, 

 rounded at the periphery, not descending in front, expanded some- 

 what at the aperture, sculptured with fine lines of growth and iudi- 



