98 THE LAXD AND FRESHWATER 3IOLLUSOA OF DORSETSHIRE. 



2. A. HORTENSIS, Ferussctc. 



This little slug is very much smaller than the common Arion, 

 it is nearly the same breadth throughout, and, when at rest, does 

 not contract its body so much; the head is small, dusky blue 

 colour, as well as the tentacles, which are short, the lower ones are 

 of a lead-blue; the shield is oblong, rounded behind, granulated, 

 usually with a dark stripe down the centre and along the margins - r 

 the rest of the back is similarly marked ; foot grey or yellow, 

 margin paler; tail lanceolate and obtusely pointed. 



Shell of an irregular shape, composed of grains, cemented 

 together by a calcareous matrix. 



Hab. Gardens and fields. Generally distributed. 



Genus IILLIMAX, Linn. 



1. LIMAX GAGATES, Dmpaniaud. 



F. and H. iv., p. 24, pi. D.D.D., fig. 3. 



Body elongate-lanceolate, tapering towards the tail, glossy, dark- 

 red or even blackabove, and yellowish-grey below; head rather large, 

 bluish grey, with darker tentacles ; shield oblong, obtuse, subtrun- 

 cate at both extremities, granulated on the surface, often darker 

 than the body, it is finely shagreened or granulated ; respiratory 

 orifice near the centre of the margin ; tentacles very short, and thick, 

 not much swollen at their tips; back sharply keeled its whole length, 

 bordered -with white or a paler colour than the rest of the body ; 

 slime nearly colourless. L.2.5. B.0.35. 



Shell small in proportion to the bulk of the shield, oval, irregularly 

 convex. 



Hab. Hedges, at the roots of grass, and the foot of old 

 walls. Under a stone at the foot of a thorn hedge, Portland, 

 September, 1857 (Mr. Darbyshire). 



2. L. MARGINATUS, MulUr. 



L. SOWERBII, F. and H., iv., p. 22, pi. E.E.E., f. 3. 



Body nearly cylindrical, and slightly enlarged in front, terminating 

 gradually to a point behind, reddish-brown, speckled -with black, 

 rugose, on the back and tail ; shield large, elongate oval, reaching 

 downwards to the sides, which a furnished with a dark band, and 

 occasionally one on the back, which has a prominennt keel, 

 extending from the hinder edge of the shield to the tail ; tentacles 

 distant, thick. L.2.5. B.0.35. 



