68 AKIONID^. 



mantle shield-like, simple, anteriorly ovate, 

 granular ; the orifice of the generative organs 

 is immediately under the respiratory aperture ; 

 subcaudal gland transverse, horizontal. The 

 jaw narrow, striated in front, and crenulated 

 on the edge (fig. 26.). Shell distinct, oblong, 

 sometimes only spongy, or only a few granules 

 in the substance of the mantle. 



The eggs separate, covered with a hard calcareous 

 shell. They lay about 70 or 100. They vary fi'om 

 twenty-five to forty days in hatching, and the ani- 

 mals attain their full growth in a year, but they 

 begin to deposit their eggs a month or two before 

 that period. 



a. Shell none, or hemispherical and spongy. (Lochea.) 



13. 1. Arion filler. Black Arion. — Tentacles black ; 

 the side of the foot marked with transverse 

 black lines; body with interrupted longitudinal 

 grooves ; shield minutely granular ; shell spongy, 

 hemispherical (fig. 28.). 



Fig. 28. 



Arion ater. 



Limax ater. Linn. Faun. Suec. 507. ; Mi'dler, Verm. 2. ; Drap. 

 122. t. 9. f. 3 — 6.; Sturm, Faun.; Nuuneley, Trans. Phil. 

 Soc. Leeds, 46. t. 1 . f. 1. t. 2. f. 1. t. 3. f. 1. 3 — 6. t. 4, & 5. 

 f. 1. — Limax rufus. Linn. F. Suec. 507. ; Razoum. ; Drap, 



