108 



are known to have in determining the intensity or distribution of its 

 colour. 



The body-whorl of No. 1 . is, generally speaking, more ventricose 

 and deeper than that of any of the other varieties; and when No. 1. 

 and No. 4. are placed side by side, the discrepancy may appear 

 somewhat startling j but if the gradations be placed before us, these 

 differences vanish, or are so melted down into each other that no- 

 thing remains fixed but the number of whorls, the style of sculp- 

 ture, the relative size of the umbilicus, and the general form and 

 make of the shell. 



Mr. Cuming found all his specimens under stones. — W. J. B. 



Bulinus mutabilis. Bui. testd cylindrico-attenuatd, subalbidd 



castaneo strigato-maculatd ; anfractibus 7 creberrime granuloso- 



striatis ; umbilico mediocri ; epidermide fused : long. 1^-, lat. -g- 



poll. 



Hab. in montibus Peruvian. (Santos.) 



Var. albo castaneoque alternatim fasciata, fasciis castaneis albo 



maculatis : long. !-§-, lat. -§- poll. 

 Hab. in Peruvia. (Campania of Truxillo.) 

 Both these varieties were found under stones. 

 The sculpture is very like that of the preceding species, but much 

 finer and closer j and indeed there is a general resemblance at first 

 sight; but the number of whorls, the cylindrical shape, and other 

 points in the species before us, sufficiently mark the difference 

 between them, — W. J. B. 



Bulinus versicolor. Bui. testd ovato-pyramidali, albidd maculis 

 castaneis, vel castaned maculis albidis varid ; anfractibus 6 minu- 

 tissime longitudinaliter subdepresso-granuloso-striatis ; labio ex- 

 teriore albente j fauce subnigro- castaned ; umbilico mediocri; epi- 

 dermide tenui : long. 1-b, lat. %poll. 

 Var. fascia albida basali. 



Hab. in montibus Peruvia?. (Mongon, near Casma.) 

 This shell varies in its colouring almost as much as Bui. multicolor t 

 King (Helix multicolor, Rang), and bears some resemblance to that 

 species at first sight. On examination, the difference between the 

 two species is very apparent. The whitish basal band of the variety 

 is seen internally as well as externally. 

 Found on bushes. — W. J. B. 



