SUCCINEA. 115 
War DIT soltdula: (Jeg). . Thicker and 
deeper coloured in consequence. 
Var, iV. witvea (A7og.,). ‘Thinner and 
more transparent in consequence. 
b. texture. 
c. colour. Var. V. dlbida (Morch). White. 
2), Ss BEEGANS (e/esant) Risso. Pl. V.,-f.04. 
More slender than fzétvzs ; usually of a deeper red 3; sz¢zve deeper ; 
mouth narrower. A. 15mm. B. 6} mm. 
This species appears to merge into the last, and often 
it is extremely difficult to determine an individual by the 
shell alone. There is, however, a difference in the 
lingual dentition, and the animal of e/egans is usually 
dark, while that of pwtris is light coloured. The main 
difference in the shells of the two species is that elegans 
has a deeper suture and a narrower mouth. Both are 
found in the same habitats, but e/egans is much more 
local than fzfris, though both have nearly the same 
range of distribution. 
Var. I. minor ( Jeff:). Smaller. 
auSiZe: | Var. II. ochracea (Betta). Smaller, thicker, 
spire longer, mouth small. 
Var. III. longiscdta (Morel). Sheil longer, 
mouth compressed. 
Var. IV. pfeiffert (Rossm.). Shorter—not 
so much drawn out. 
b. shape. 
