44 



LIMACID^E. 



ica, at Nisqually by Lieut. Case, and at Discovery Har- 

 bor, Puget Sound, by Mr. Dyes. 



REMARKS. There can be no doubt that the mottled ani- 

 mals are varieties of the uniformly colored ones, because 

 they were not only taken in company, but in coitu. 

 A smaller specimen is of a uniform slate color. It gen- 

 erally resembles A. empiricorum in form, marking, and 

 coloring, with the exception of the head, which in that 

 species is slate-colored. The position of the respiratory 

 orifice is also much more anterior. No land mollusk 

 has yet been found to the west of the Rocky Mountains 

 identical with any species on the Atlantic side ; and 

 although several European slugs have been carried to 

 distant shores, where they have become naturalized in 

 limited districts, it is too much to suppose that any of 

 them have thus become numerous at several localities 

 about Puget Sound. 



