78 MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 



Limax agrestis. Linn. Syst. Nat.i. 1082. — Limax cinereus, par- 

 vus, immaculatus, pratensis. List. Anim. Angl. 130. — Limax 

 agrestis. Nunneley, Trans. Phil. Soc. Leeds, i. 47. PI. 1. f. 4. — 

 Limax agrestis. Gray's Turton. 117. — Limax agrestis. Lamk. 

 Syst. Ed. 2. vii. 717. — Limax agrestis. Flem. Brit. Anim. 2o6. 

 4. Limax margindtus. Margined Slug. 



Shield elongated, free anteriorly for more than half its 

 length, with large concentric undulated ridges, cloak with 

 numerous parallel undulated ridges, interrupted behind ; the 

 whole length of the body with a rather obtuse keel, more pro- 

 minent and undidated behind ; neck scarcely extending a 

 fourth of the length of the shield, which is didl yellowish- 

 grey with two longitudinal pale-brown bands; hind part of 

 body bluish-gi'ey, the keel yellowish-white ; surface of the foot 

 with three longitudinal bands, of which the medial is less 

 than half the breadth of the lateral. 



The form is very elongated, flat beneath, laterally com- 

 pressed, very convex above, with thin, transversely sulcate 

 margins. The upper tentacula rather short, cylindrical, knob- 

 bed, granulated; the lower very short. The neck projecting 

 about a fourth of the length of the shield, with a narrow 

 medial ridge, and two broad transversely grooved ridges. 

 The shield is elongated, broader and rounded behind, but 

 with a slight apex. It is marked with strong imdulated con- 

 centric ridges, and toward the hind part has an irregular pro- 

 minence over the shell, which is broadly elliptical, nearly flat, 

 thick, irregularly rugose, shining, white, covered above with 

 crystalline granules. The body marked with longitudinal 

 convex, undulated ridges, which toward the hind part are 

 interrupted. An obtuse keel extends its whole length, be- 

 coming more elevated and somewhat undulated behind ; the 

 tail much compressed and rather pointed. The lateral mar- 

 gins are thin, with transverse rather distant sidci. The foot 

 very narrow, with the lateral bands more than twice the 

 breadth of the medial. The tentacula and a band running 

 from them along each side of the neck, pale-brown ; the eyes 

 black ; the shield yellowish-grey with two broad lateral pale- 

 brown bands ; the keel yellowish-white, the rest of the body 

 of a delicate light bluish-grey ; the foot bluish-grey, with paler 

 margins. Length two inches. The pulmonary aperture less 

 than a third of tlie length of the shield distant from its hind part. 



It differs from Limax cinereus, to which it comes nearest, 

 in many essential respects, as wiU be seen on comparing the 

 descriptions of the two species. 



