56 CATALOGUE OF THE MOLLUSCA 



respect it is extremely variable, and is sometimes quite smooth. 

 It undergoes all the varieties of colour and banding found on the 

 last species, besides which we have obtained, at Newbiggin, a 

 black, and a tessellated variety, coming so near to L, tenehrosa 

 that we hesitate to call them distinct. The latter is generally 

 found in mud, but we are inclined to think that the Turbo 

 tenebrosus, and T. jugosus of Montagu are probably the two ex- 

 treme limits that this very variable shell undergoes. 



4. L. NEGLECTA, Bccm. 



Littorina saxatilis, "Bean," Johns, in Berw. C. Proc. i., 268. 

 Littorina neglecta, Bean, in Thorpe's Brit. Mar. Conch. 266. 

 On rocks near low-water mark, bare of sea-weed, but covered 

 with Balani and muscles. 



The habitat of this little species is different from that of the 

 preceding, being always nearer low-water mark. This, with the 

 difference of form and size, induces us to think it distinct. 



We have taken from the body of this species, embryos, well 

 developed and covered with a shell. — A. H. 



It was first described by Dr. Johnston under the name of 

 saxatilis, given it in manuscript by Mr. Bean. In consequence 

 of this name having been used by Olivi for another species (pro- 

 bably the following), Mr. Bean subsequently changed it to 

 neglecta, under which name he has described it among his new 

 species in Thorpe's " Brit. Marine Conchology." Having omitted 

 to mention that it had been described before, the species appears 

 twice in that work : — viz., under the name of L. saxatilis, in the 

 Addenda, and of L. neglecta, in the Supplement. 

 5. L. PETR^A, Mont. 



Helix petrma, Mont. Test. Brit. 403. 

 Turbo caeridescens, Lam. Anim. s. Vert. 2nd Ed. ix. 217. 

 On rocks at and above high-tide level, frequent, especially in 

 crevices of the clifis, where it nestles in company withZ. rudissima, 

 beyond the reach of the sea, excepting the dashing of the spray 

 and the high water of spring tides. 



There can be little doubt that the T. ccerulescens of Lamarck, 

 of which we have specimens from two localities in the Mediter- 

 ranean, is a variety of this species, though Philippi, in his 

 description of the animal, does not mention the milk-white 



