SPIEIALIS. 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. 



SPIEIALIS, Eydoux. 

 S. FLEMINGII, Forbes. 



S. Flemingii, Brit. Moll. ii. p. 384, pi. 57. f. 4, 5, and iv. p. 258 ; 



(animal) pi. M.M. f. 1, and pi. U.U. f. 4, as Peracle. 

 S. MacAndrei, Brit. Moll. ii. p. 385, pi. 57. f. 6, 7. 

 S. Jeffreysii, Brit. Moll. ii. p. 386, pi. 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. 



TKOCHID.E. 



This ancient Linnsean 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, in 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- 

 nidte. 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, 



