COCKERELL AND COLLINGE : CHECK-LIST OF SLUGS. T97 



As it seems to me, the real question of the specific or 

 subspecific validity of cinereo-niger is not solved by the 

 statements made by Messrs. Roebuck and Collinge, and it 

 still remains to be asked, can both maximus and cinereo- 

 niger be obtained from eggs laid by a single slug of either 

 kind ? If not — and I do not believe myself that they could 

 — cinereo-niger is a valid subspecies or species. Then, if it 

 be found (as seems to be the case) that cinereo-niger, thus 

 distinct, intergrades with maximus in certain localities, it is 

 not a species but a subspecies, and that, I believe, is its 

 proper rank. 



Of course it follows from this way of looking at the 

 matter, that some of the older and more distinct varieties 

 of horses, dogs, &c., known to have developed under 

 domestication, are subspecifically distinct, and this, 

 I think, is a just conclusion. 



10. I have restored the name geographicus, as it no doubt belongs 

 to dacampi, and is older and also appropriate. 



13. Z. ftingivorus is placed by its author in Ma/acolimax, but 

 Simroth says it is a young cinereo-niger form ! 



21. Bottger described it as a variety of maximus, his name takes 

 priority. 



31. To tenellus have been referred aureus, Gmel., and squam- 

 matinus, Morel., but it appears that the first is an Arion, 

 the second a Geomalacus. 

 31 b. I have seen no description of griseus. 



34. Z. raymondianus. Simroth has referred this name to a variety 

 of Amaiia gagates, but I can hardly believe he is right. 

 Pollonera has recognised a true Malacolimax as raymon- 

 dianus. 



36. Z. nyctelius. Mr. Pollonera has sent me this from Algeria. 



A species formerly called nyctelius by Simroth seems to be 

 subsaxanus. 



37. L. valentianus. According to Simroth, this is a race of 



arborum (marginatus). Mr. Pollonera sent me a specimen 

 from Barcelona, and it seemed to me quite distinct from 

 marginatus. However, so far as external marks went, 

 I could see no specific difference between valentianus and 

 nyctelius. 



38. L. fulvus. Simroth suggests that this ma)' be a yellow form 



of tenellus. 

 41. Z. marginatus. I believe sylvestris is the same, but it is too 

 poorly described to be certainly recognisable. 



