APJON. 9 



and rather large. They may be found under large stones, 

 or logs of wood, abundantly in autumn. The young when 

 it comes out, is of a speckled yellowish-fawn colour. Mr. 

 Nunneley remarks that it lives much longer than the 

 Limaces. It is universally distributed in the British Isles, 

 and has a wide range throughout Europe. 



A. flavus, Midler. 



Resembling Avion enqyiricorum, but more elongated, the disk 

 more oblong ; secreting a yellow mucus. 



Plate F. F. F. fig. 2. 



Avion flavus, Ferussac, Hist. Moll. Suppl. p. 96 b. No. 7. — Bouchard Chan- 

 tereaux, Mem. Soc. Ag. Boul. 2nd ser. vol. i. p. 159. — 

 Alder, Cat. Moll. Northumb. p. 30. 



Limax „ Muller, Verm. vol. ii. p. 10. — Nillson, Moll. Scand. p. 5. 



We figure this Arion from a drawing kindly communi- 

 cated by Mr. Alder, by whom it was first recorded as 

 British, in the Catalogue of the Mollusca of Northumber- 

 land and Durham. Of it he states, " Onr individual was 

 about an inch in length, with the body whitish, having a 

 faint greyisli tinge above. The shield and the posterior 

 parts of the body near the tail, were of a pale canary- 

 colour. Tentacles greyish-white. The mucus was deep 

 orange-yellow. " A specimen taken " at the side of the 

 turnpike road, Westgate hill," in the same district, by 

 Mr. J. Blacklock, was rather darker, more greenish in 

 colour on the back, and more orange in the shield. The 

 upper tentacles, through some malformation probably, 

 were eyeless. M. Bouchard Ohantereaux considers this 

 species very distinct from Arion empiricorum. He describes 

 it as yellowish or grey ; mantle short, rounded at its 

 extremities, finely granulated ; tail orange or yellow ; 



