LAMELLAEIA. 467 



The following have not occurred to me alive : 



N. SORDIDA, Philippi. 

 N. sordida, Brit. Moll. iii. p. 334, pi. 100. f. 5, 8 ; (animal) pi. P.P. f.3. 



N. MONTAGUI, Forbes. 



N. Montagui, Brit. Moll. iii. p. 336, pi. 101. f. 3,4 ; (animal) pi. P.P. 

 f. 4. 



N. PUSILLA, Gould. 

 N. pusilla, Brit. Moll. iii. p. 341, pi. 100. f. 7. 



N. HELICOIDES, Johnston. 

 N. helicoides, Brit. Moll. iii. p. 339, pi. 100. f. 6. 



? N. KINGII, Forbes and Hanley. 

 N. Kingii, Brit. Moll. iii. p. 343, pi. 101. f. 1,2. 



LAMELLARIA, Montagu. 



This genus has not more than one or two British species. 

 The excellent Montagu, the discoverer of one of them, consti- 

 tuted the genus Lamellaria to receive it. We are bound to 

 adopt this generic term, though Coriocella would have been 

 more significant, and place in it the L, tentaculata of Mon- 

 tagu, and the L. haliotoidea of authors, which latter has 

 been continually shifted from one genus to another. Both 

 these species have, at times, been deposited by mistake in the 

 exotic genus Siyaretus, after Lamarck, who had been misled 

 by M. Cuvier having erroneously described the Helix halio- 

 toidea of Linnaeus as Adanson's Sigaretus, which has an ex- 

 ternal shell. M. Blainville expressly formed the genus Corio- 

 cella to receive M. Cuvier's animal, which is undoubtedly 

 identical with the L. perspicua, but Montagu's appellation 

 claims the priority as to time. As to the natural position of 

 this genus, we must have recourse to that unerring magnet, the 

 malacology of the animal, which consigns it to the vicinity of 

 Murex. This situation, which has already been alluded to by 

 authors, has been looked on by the older zoologists as unna- 

 tural, but, like the preceding genera, it can only be brought 

 into the line of natural order by being deposited as an ano- 

 malous Muricidal excrescence. 



