cockerell: revised list of British slugs. 67 



as the types, the arrangement being rather one of diverging 

 forms round a type placed in the middle of the genus. 

 Linnean genera were not represented by a type species, like 

 modern genera, and a selection of the first-named as the 

 type would cause many unnecessary difficulties. Brard's 

 Limacella (1815) consisted of the shells of slugs, and does 

 not merit recognition. Turton in 1831 called it Limacelliis, 

 but no author since that date has attempted to make one 

 genus out of a slug and another out of its shell ! Jousseaume 

 (1876) made Brard's Limacella to include the Limax of 

 modern authors, and used Limax for Avion, but nobody 

 has followed this arrangement. 



L. maximus L., 1758. 



Note. — ' Z. cinereus maculatiis ' of Linne must 

 surely be this species, and not cinereo-niger, as some have 

 thought. Z. cellariits D'Arg. has priority (1757), but is prc- 

 Linnean and therefore inadmissible. 



L. cinereo-niger Wolf, 1805. 



Subg. LEHMANNIA Heyn. 1863. 

 L. marginatus Mull., 1774. 



Note. — Miiller's description evidently refers to what 

 we call arboriim B.-Ch. (1838). Z. sylvestris Scopoli, 1772, 

 is almost surely the same species, and it has priority. The 

 description is so vague as to leave a doubt, however, so I 

 do not here adopt Scopoli's name. 

 L. flavus Linn., 1758. 



Note. — There can be no doubt \.\\-3X flaznis I., is what 

 has been more generally called variegatus Drap. (iSor). 



Subg. MALACOLIMAX Malm, 1868. 

 L. tenellus Nilss., 1822. 



Note. — I am not aware that any British specimen of 

 tenellus has been found of late years, nor do I know where 

 an example is preserved. 



