inhabiting the United States. 165 



long-oval uucolored spots which have a longitudinal disposi- 

 tion ; mantle with rounded spots ; head, neck, and superior 

 tentacles blue, semitransparent ; lower tentacles white ; base 

 of foot sallow white. Body when extended cylindrical, 

 elongated, terminating acutely with a short but prominent 

 keel : upper part covered with long and narrow prominent 

 tubercles. Mantle ample, oval, rounded at both ends, with 

 numerous very fine concentrical striae. Sides paler, and 

 without spots. Respiratory foramen large, placed near the 

 posterior lateral margin of the mantle and cleft to the edge. 

 Generative orifice indicated by a white spot a little behind 

 the upper tentacle of the right side. 



Length, when fully extended, nearly three inches. 



Geographical Distribution. Noticed hitherto only in 

 the city of Philadelphia. 



Remarks. The contrast of colors, and the elegant arrange- 

 ment of the spots and lines, render this a beautiful species. 

 The tubercles of the surface are very fine, and so much com- 

 pressed as to appear in some lights to be carinated. There 

 is often a well defined row of spots down the back. The 

 upper tentacles are long and delicate, the mantle sometimes 

 terminates posteriorly in an obtuse point, and the locomotive 

 band of the foot is narrow and well defined. There is a 

 prominent ridge on the head and neck between the tentacles, 

 and a furrow marks the edges of the foot. It is active in its 

 motions, turns rapidly, and often bends the body so as to form 

 two parallel lines. It does not secrete mucus so freely as 

 Limax agrestis. The carina is often yellowish. The testa- 

 ceous rudiment is oblong-oval, convex above and concave be- 

 low, thin and membranaceous, with the superior surface 

 smooth, and the lower uneven. No spiral arrangement is 

 visible to the eye, and it appears to be only a thin testaceous 

 plate imbedded in the mantle. 



It inhabits cellars and gardens in moist situations in the 

 city of Philadelphia, where it is considered noxious to vege- 

 tation. It feeds upon the leaves of plants in kitchen gardens, 

 and upon the remains of the cooked vegetables, and bread, 

 thrown out from houses. It is common, but not so numerous 



