24 



Helix eurydice. Testa tenuis, depresso-pyramiclata, acutis- 

 sime carinata, pallidc virens, linea castanea volvente supra et 

 infra picta, subtus planulata, umbilico lato et profundo perforata : 

 spira anfr. 5-6 vix convexis, apicc rotundato : apcrtura trans- 

 versa, acute triangularis ; labro acuto. Lat. J-f , alt. fcfa poll. 

 Hnb. Tongataboo. 



Approaches H. Cirsoid a, but is much thinner, nearly trans- 

 parent, of a much smoother texture at surface, flatter beneath, 

 and the coloring seems to be very uniform. The color of the 

 animal is also different. Its shape is almost precisely that of 

 H. elegans, though much larger. It is also like H. planorboidcs, 

 Lesson, (H. solarium, Quoy), which is very much smaller and 

 destitute of fillets. 



Helix subtilissima. T. minuta, fragilissima, nitidissima, 

 lenticularis, plano-convexa, imperforata : spira planulata, anfr. 5 



planis, arete volutis ; ultimo acutissime carinato : apertura 



(fracta). Lat. £, alt. -^ poll. Hah. Maui, Sandwich Islands. 



This little pellucid shell, though imperfect, is so well marked 

 by its compressed lenticular form, sharp carination and numerous 

 whorls, that I venture to pronounce it a new species. 



Helix (Nanina) scorpio. Testa rotundata, depressa, rubro- 

 castanea, fasciis radiantibus atro-purpureis tessellata, subtus baud 

 convexa : spira depressa, anfr. 4J- convexis. Lat. f , alt. f poll. 

 Hah. Fcejee Islands. 



The above characters were drawn from the figure of a shell 

 which looks somewhat like Cyclostoma tigrinum. Its inhabitant is 

 most peculiar ; having, besides the usual anal lappet of Nanina 

 coverin"- the mucus pore, six other smaller ones between this and 

 the shell, arranged in a double series along the back. 



Helix (Nanina) ruida. Testa fragilis, obconica, oblique 

 striata, epidermide tenui subconcentrice et confertissime rugosa 

 induta, coloribus sordide viridibus marmorata, subtus valde con- 

 vexa, perforata : spira anfr. 44- planulatis, ultimo superne angu- 

 lato : apertura lunata ; labro acuto ad umbilicum reflexo. Lat. 

 J-, alt. | poll. Hah. Feejee Islands. 



The specimens collected appear to be immature, but the pe- 

 culiar minute wrinkling of the epidermis, somewhat like that on 

 Planorhis alhus and hinulus, may serve to characterize it. 



