LIMAX. 37 



DESCRIPTION. 



Color varying from whitish through every shade of 

 cinereous and gray to black, and through various shades 

 of yellowish, or amber-color, to brownish, and sometimes 

 irregularly spotted with small black points or dots ; tenta- 

 cles darker than the general surface, sometimes black ; 

 mantle sometimes mottled with a lighter color ; base of 

 foot sallow white ; sheath of tentacle indicated 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 pos- 

 terior extremity compressed upwards, so as to form a 

 short carina or keel ; foot very narrow. Mantle oblong- 

 oval, fleshy, convex and prominent, rounded at both ex- 

 tremities, equalling in length one-third of the length of 

 the body, its surface marked by prominent, irregularly 

 waved, concentrical lines and furrows, having their centre 

 on the posterior part, and its edges free throughout the 

 whole circumference. Upper surface of the body marked 

 with longitudinal lines, or shallow furrows, darker than 

 the general surface, sometimes black, anastomosing with 

 each other, and forming a sort of net-work ; between the 

 reticulated lines are narrow, irregular oblong plates, or 

 smooth, flattened tubercles, giving the surface the ap- 

 pearance 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 superior tentacles backward to the 



