LIMAX. 63 



Lingual membrane very broad, of 100 rows of 85 teeth each 



Fig. 105. 



Lingual dentition of Limax flavus. 



(42 — 1 — 42) ; teeth long, slender ; centrals tricuspid, laterals 

 tricuspid ; uncini aculeate. 



Liniax agrestis, Linn. — Color varying from whitish through every 

 shade of cinereous and gray to black, and througli various shades of yel- 

 lowish, or amber-color, to brownish, and sometimes irregularly spotted 

 with small black points or dots ; eye-peduncles and tentacles darker than 

 the general surface, sometimes black ; mantle sometimes mottled with a 

 lighter color ; base of foot sallow white ; sheath of eye-peduncles indi- 

 cated by black lines extending backwards from their base under the edge 

 of the mantle. Body when in motion cylindrical, elongated, terminating 

 acutely, the sides towards its posterior extremity compressed upwards, so 



Fig. 106. 



Limax agrest 



as to form a short carina or keel ; foot very narrow. Mantle oblong-oval, 

 fleshy, convex and prominent, rounded at both extremities, equalling in 

 length one-third of the length of the body, its surface marked by promi- 

 nent, irregularly waved, concentrical lines and furrows, having their centre 

 on the posterior part, and its edges free throughout the whole circum- 

 ference. Upper surface of the body marked with longitudinal Hues, or 

 shallow furrows, darker than the general surface, sometimes black, anas- 

 tomosing with each other, and forming a sort of network ; between the 

 reticulated lines are narrow, irregular oblong plates, or smooth, flattened 

 tubercles, giving tiie surfa^ie the appearance of a mosaic work, with lines 

 of dark cement ; reticulations less distinct on the sides, and disappearing 

 towards the base ; a prominent tubercular ridge extends from between the 

 eye-peduncles backward to the mantle, with a furrow on each side. Eye- 



