1887.] FROM THE LOO CHOO ISLANDS. 317 



species. In the series of eighteen specimens from Loo Choo I find 

 considerable differences in form, some being much higher and more 

 globose than others. One example is of a peculiar purplish-brown 

 colour, and another is remarkable in having a thickening or limbus 

 within the hp. 



2. Helix mercatoria, Gray. 



This species varies considerably in intensity of colour, from a very 

 deep black-brown to pale yellowish olive, and the lines of growth in 

 some examples are very much coarser than in others. One specimen 

 with a comparatively smooth surface has the peripherial dark band 

 unbordered by a pale zone on each side as usual. The colour of the 

 peristome is also variable, being in the dark or most common forms 

 purplish brown, and of a pale flesh-tint in shells of a lighter colour. 



3. Helix luhuana, Sowerby. 



The two specimens which I assign to this species are rather young 

 and consequently thinner than adult shells. They differ also from 

 the typical form in colouring, having only faint indications of trans- 

 verse bauds and much more distinct spiral strise, in which respect 

 they exactly resemble H. peliomphala from Japan. 



4. Helix largillierti, Phihppi, var. 



Testa perforata, globoso-conica, mediocriter tenuis, incrementi 

 lineis oblique arcuatis tenuiter striata, sordide albida, zonis 

 duabus nigro-fuscis cincta, epidermide tenuissima flavescente 

 induta ; anfractus 6, convexiusculi, sitperne ad suturam angus- 

 tissime submarginati, ultimus subglobosus, ad peripheriam supra 

 aperturam obsolete angulatus ; apertura late lunata, longit. 

 totius I subcequans ; peristoma expansum, albidum vel dilutissime 

 rosea finctum, margine columellari rejlexo, umbilicum setni- 

 obtegente. Diam. max. 27 millim., min. 23, alt. 25. 



Helix largillierti, var. 



In form this variety very closely approximates to H. callisona, 

 Crosse, but may be slightly higher in the spire. That species, 

 however, according to Martens ^ and some specimens from Kiga, 

 Japan, which I have assigned to it, is very distinctly spirally striated, 

 as is the case in H. peliomphala and other allied species from 



^ Pfeiffer's Novitates Conch, vol. v. p. 31. 

 Proc. Zool. Soc— 1887, No. XXII. 22 



