SPIRIALIS. 303 
These shells appear not to have occurred south of the 
Tweed; indeed the family, as the learned authors of the 
‘British Mollusca’ observe, is almost without the pale of 
British malacology. 
Since this was written, I have learnt that Hyalea is an 
exotic genus. 
SPIRIALIS, Eydoux. 
S. Fieminert, Forbes. 
S. Flemingii, Brit. Moll. ii. p. 384, pl. 57. f. 4, 5, and iv. p. 258 ; 
(animal) pl. M.M. f.1, and pl. U.U. f. 4, as Peracle. 
S. MacAndrei, Brit. Moll. ii. p. 385, pl. 57. f. 6, 7. 
S. Jeffreysii, Brit. Moll. ii. p. 386, pl. 57. f. 8. 
Dr. Fleming discovered this species on the Scotch coasts, 
and it has been taken by Professor Forbes on the south-west 
coast of Skye. For some account of the animal, see the 
Appendix of the ‘ British Mollusca,’ vol. iv. p. 258. 
This is a variable species as to contour, being subject to 
more or less elongated and depressed phases of the spire, 
which have caused two of the varieties to be mistaken for 
distinct species. 
TROCHID A. 
This ancient Linnzean family comprises the British genera 
Trochus, Phasianella, and ? Scissurella. The distinguishing 
typical characters of the animal are the amplitude of the 
operculigerous lobe, its various fringes and tentacular fila- 
ments. Phasianella, im the operculum, does not conform to 
the normal circular figure, and is not a strict Trochidan ; it 
probably forms the passage from that family to the Littori- 
nide. The Helix subcarinata of Montagu, being the Adeorbis, 
nonnull., is admitted provisionally as a Trochus ; it is singular 
that the animal has escaped every naturalist’s research, yet 
the shell is common in the coralline district, but without 
the animal or operculum. I have frequently found, in com- 
pany with it, a beautiful, minute, testaceous, multispiral, 
