COLLINGE : REVIEW OF THE ARIONID^ OF THE BRITISH ISLES. 63 



and of an ovoid form, varying greatly in size. The largest I have 

 seen were 3 J- x 2% ram. ; Scharff gives their size as 3 x 2J mm., and 

 of some deposited in captivity 2^ x 2 mm. 



Variation. — The three principal varieties of this slug are a red, 

 a grey, and a yellow form. 



a — Var. nov. lateritius. Whole of body a deep brick-red, not due 

 to the mucous ; bandless ; foot-fringe light-grey ; lineoles light-brown 

 or chocolate. 



This is not unlike in colour the A. rufus Cont. Auctt., viz., a 

 pure brick-red. The colour rapidly fades in alcohol. I am indebted 

 to Mr. A. W. Borthwick for examples of this variety, obtained at 

 Mount Melville, N.B., where he informs me it is fairly common. 

 Being a distinct and well-marked variety, I am grouping the minor 

 red forms under this name. Some little time ago I sent 

 Mr. Cockerell descriptions of a number of the more important 

 variations that had come under my notice. For the ordinary red ? 

 form I proposed the name rufescens, but Mr. Cockerell points out a 

 fact I had overlooked, viz., that Locard named a variety rufescens, 

 but did not, he thinks, describe it. He also mentions another form, 

 viz., v. vormanni, Locns., which is a deep orange-red, varying, 

 however, to yellow. The rufo-fuscus, Drap., is another minor red form. 

 b — Var. nov. griseus. Grey, with light sides, bandless. The var. 

 krynkkii, Kal., is a form of this variety. Mr. Cockerell sends me 

 the following description : — " Described as a species — is yellowish- 

 grey above, whitish below, with the banding becoming obsolete." 

 Locard has named a var. cinereus, but I think the same has not been 

 described, in which case it would also fall under this variety, and 

 v. cinereo-fuscus, Drap. 



c — Var. succineus, Bouill. = v. flavescens, Cllge. MS. This is 

 figured by Scharff (35, pi. lvi., fig. 18). 



d — Var. aurantiacus. Probably very closely allied to the pre- 

 ceding variety. 



Arion intermedius, Normand., 1852. 

 Limax intermedins, Norm., Descr. six Limaces nouv. 1852. 

 Arion flavits, Moq.-Tand., Moll. terr. et fluv. de France. 1855. 



,, liortensis, Jeffreys, Brit. Conch. 1862. 

 Geomalacus intermedins, Mabille, Rev. Zool., p. 57. 1867. 

 ,, bourguignati, Mabille, Rev. Zool., p. 58. 1867. 



,, hiemalis, Drouet, Moll. Cote-d'Or., p. 27. 1867. 



„ Baudon, Limac. du Dept. de l'Oise, pi. ii, fig. 



2—4, 1871. 

 ,, niabilli, Baudon, Limac. du Dept. de l'Oise, p. ii, pi. i, 



fig. 8 — 12, 187 1. 



