MALACOZOA, GASTEROPODA. PULMOBRANCHIATA. 77 



circumstances ; from Limax agrestis in not having the keel 

 oblique. 



Its slime is limpid ; but, when irritated, it secretes a thicker 

 bluish-white mucus. When on a twig, or other place, whence 

 it cannot proceed in the direction intended, it allows itself to 

 drop, being at first slowly lowered by the thread of adhesive 

 mucus, which at length gives way. 



In damp places, as beneath turf or stones, by walls, 

 among plants, or sometimes about houses. 



Limax flavus. Linn. Fauna. Suec. 363. Limax variegatus. 

 Drap. Hist. Moll. 127. Limax variegatus. Nunneley. Trans. 

 Phil. Soc. Leeds. I. 47. T. 1. f. 3. Limax flavus. Grey's Turt. 

 114. Limax variegatus. Feruss. Hist. Moll. 71. T. 5/f. 1-6. 

 Limax variegatus. Desh. Lamk. Syst. Ed. 2. vii. 722. 



3. Limax agrestis. Field Slug. 



Shield large, broadly rounded behind, subconcentrically 

 striato-sulcate ; body with numerous longitudinal interrupted 

 broad subgranulate ridges ; a short keel bent obliquely toward 

 the end ; upper parts yellowish-grey, or pale brownish-yel- 

 low, somewhat mottled with dusky and whitish. 



The form oblong, very convex above. The upper tenta- 

 cula long, tapering for half their length, then cylindrical, very 

 slightly enlarged at the tip ; the lower very short ; the neck 

 protruding to nearly half the length of the shield, with a nar- 

 row convex medial ridge ; the shield large, broadly rounded 

 behind, marked with subconcentric striae, the ridges between 

 which are subgranulate ; the rest of the surface with nume- 

 rous interrupted broad, convex subgranulate ridges ; the keel 

 about a fifth of the whole length, and bent obliquely toward 

 the end ; the tail pointed ; the surface of the foot with three 

 longitudinal bands. The head, neck, and upper tentacula 

 light brown, the eyes black ; the upper surface light brown- 

 ish-yellow, or yellowish-grey, somewhat mottled with lighter 

 and darker tints, and with the sulci dark-coloured ; the keel 

 yellowish ; the lower surface pale grey, margined with yel- 

 lowish. Length about an inch and a-half. 



It varies considerably in colour, being sometimes whitish 

 or cream-coloured, or grey, or somewhat dusky. 



When irritated it emits from the sulci a thick milky fluid, 

 which leaves a white film when dry. It drops from a height 

 by means of the slimy thread of its mucus. 



Abundant, and generally distributed, occurring infields, pas- 

 tures, gardens, thickets, and on grassy banks, and by fences. 

 G 2 



