LAND AND FRESH-WATER SHELLS. 347 



(63) Neritina brevispina (Lamarck) Hab. Streams in Shortland, Treasury, 



and Ugi Islands. The specimens from Treasury Island were desti- 

 tute of spines. 



(64) Neritim squarrosa (Recluz) Hab. Streams in Treasury Island. 



(65) Navkella sanguisuga (Reeve) Hab. Streams in Faro Island, Bougain- 



ville Straits. 



(66) Navicella siiborbicularis (Sowei-by) Hab. Guadalcnnar, St. Christoval, 



L'gi, Treasury and Faro Islands in Bougainville Straits. 



(67) Unio guppyi (nov. spec.) Hab. Streams in the Shortland Islands. 



(68) Cyreim, spec. Hab. In the lower parts of streams and in mangrove 



swamps, Choiseal Bay. Kote. — This species is not referred to in the 

 original paper. 



Descri2)tions of the new species and varieties,^ by Mr, E. Smith. 



(2) Helix {Nanina) nitidissima. (Plate XXXVI. figs. 1, 1 h.) Shell thin, 



transparent, very glossy, depressed, naiTowly perforate, pale brov\nish 

 horn-colour above, whitish towards the umbilicus, sculptured with 

 very faint lines of growth. Whorls 4-5, slightly convex, impressed 

 and margiaate above at the suture ; last whorl large, rounded at 

 the periphery. Aperture obliquely lunate ; peristome simple, thin, 

 slightly thickened and reflexed pai-tly over the perforation. Spire 

 low, but very little raised above the last whorl, obtuse at the apex. 

 Greatest diameter 14 millim., smallest 12 ; height 9. 



(3) Helix {Nanina) soUdiuscida. (Plate XXXVL, figs. 2, 2 b.) Shell very 



narrowly perforate, de[)ressed, somewhat solid, dark chestnut-brown 

 and a little glossy above, more shining and paler beneath, becoming 

 almost white at the umbilical region ; whorls 6i, convex, separated 

 by a deepish suture, and, with the exception of two or three at the 

 apex which are smooth, sculptured with strong, close-set, arcuate, 

 and oblique striae on the upper surface, crossed with a few more or 

 less distinct spiral lines. Body-whorl I'ounded at the periphery, or 

 sometimes with the faintest indication of an angle, convex, and only 

 exhibiting fine lines of growth below. Aperture obliquely semi- 

 lunate ; peristome simple, but, owing to the solidity of the shell, 

 seeming slightly thickened, especially on the very oblique collumellar 

 margin, which is shortly reflexed above over the perforation. Spire 

 depressed-conoid, having tlie least convex outlines and an obtuse 

 apex. Greatest diameter 18 millim., smallest 16|-, height 12; aper- 

 ture 8 long, 4^ wide. 



This species is well distinguished by its comparative solidity and 

 strong sculpture on the upper surface. 



(4) Helix (Corasia) tricolor (Pfeiffer). (Plate XXXVL, figs. 3, 3 b.) A 



specimen obtained on the north coast of the same island of St. Chris- 

 toval, by Mr. Guppy, is worthy of special mention, and may be 

 termed \ar.picta, on account of the undulating reddish-brown stripes 

 which ornament both the upper and lower surfaces. 



A similar example was also collected by Dr. A. Corrie and pre- 

 sented to the Museum. The markings on these two shells are very 

 striking- and distinctly' visible within the aperture. 

 (U) Helix (Geotrochus) guppyi. (Plate XXXVL fig. 4.) Shell elevately 

 conical, thin, pale yellow, ornamented with conspicuous nearly 

 black or black-brown spiral bands, one above and one below the 



The numbers refer to the plates in Mr. Smith's paper (Proc. Zool. Soc. , June 1885). 



