ARION. 29 



posterior extremity, is very apparent, and has a process 

 of the skin which seems to cover it, and sometimes to 

 project above it. When fully gi-own, the extreme length 

 is more than two inches, its usual length about one inch. 



Remarks. When the anitaial is fully extended, the 

 mantle occupies less than a fourth part of its whole 

 length, and the dark lines on the mantle and back are 

 continuous with each other. The head only, projects 

 from the mantle, the neck not being visible. Its sm'face 

 is constantly covered with a watery mucus, and it sus- 

 pends itself with a thread of mucus like the other spe- 

 cies. The mucous secretion from the tenninal pore is 

 transparent and very viscid. It is not distinguished by 

 any considerable variety of color or markings. It occurs 

 in small numbers in the vicinity of Boston, under stones, 

 at road-sides, in company with Limax agrestis, and more 

 plentifully in gardens within the city. In our remarks 

 on this species, formerly published, we hesitated in con- 

 sidering it to be identical with the foreign species of the 

 same name. Having since found it somewhat numerous 

 m a locahty in the city, we have procured specimens 

 agi-eeing very well with foreign descriptions and figures, 

 especially with that variety described by M. Ferussac as 

 " griseus, unicolor, fasciis nigris," and have no longer 

 any doubt on the subject. The specimens found in gar- 

 dens are however, much larger than the size indicated by 

 the descriptions. It is called a small species by both M. 

 Ferussac and M. Lamarck, and so it is, as it exists in the 



