COCKERELL AND COLLINGE : CHECK-LIST OK SLUGS. 39 



However, the slug is probably only subspecifically distinct 

 from A. stcbfuscHS, to which it may be allied through such 

 forms as voruiauni. 



Simroth has shown that intermedins {iiiiNii/ius) is quite 



distinct from all suhfiKCus forms, and consequently whether 



campestris is a variety or sub-species of snbfusciis, or an 



allied species, it ought not at the present day to be 



confounded with interinedius. But the outward similarity is 



such, that in dealing with the old descriptions we can 



hardly come to any certain judgment. Simroth has 



remarked, however, on the large size of Midler's flavus^ 



which seems to distinguish it from interinedius. 



Mi-iller's Arions have always been a source of perplexity, and 



it may not be amiss to give some account of them for the 



benefit of those who cannot consult the original work. 



O. F. Miiller. — Verm. Teir. et Fluv. Hist.,vo\. 2 (1774). 



p. 2. Li max ater. The first variety is the Linnean 



ater. The fourth variety " fnscocastaneus, ora 



lutescente ; subtns ail'is," is said to be L. subrufns, 



Linn. 



p. 4. Limax albns. With four varieties. 



p. 7. Limax snccineus. "Z. supra sub?-2i/us, subtus 



albns." '■'■Long. i\ nnc. Rn/o-Juscus vel succini 



coloris est absque macnlis ant cingnlo. Tentacnla 



majori snperne nigra; inter haec linea obscura." 



With reference to L. siibrnfus, L., Syst. 3, and 



Hill, Anim. p. 87, 1. c. Miiller here makes some 



mistake, as L. snccineus and L. ater\:\.r. (as above) 



either should not be separated, or are not both 



subrufus, L. 



p. 9. Limax ductus. Two inches long, yellowish, 



amber above, white beneath, band and back with 



grey bands. What is this ? A form of sul'Juscus t 



It is to be noted that this is \\\^t first banded Arion 



ever named, so whether it might be subfuscus, 



intermedins, Iiortensis, or what not, it has priority. 



Morch has reported A. cincius from Iceland. 



p. 10. L.fiavus, see above. 



p. II. L. Juscus. Reddish with black tentacles, white 

 beneath. " Linea laterali dorsoque nigricante." 

 Lenuth 8 lin. 



