ARION. 275 



Arion fuSCIlS, Mcller. — Color whitish or liglit ashy, sometimes 

 with a tinge of brown, or dark grayish ; an obscure, ill-deiiued dark colored 

 line or band rises where the mantle meets the base of the {entacles on both 

 sides, and extending along the whole length of the mantle to its posterior 

 extremity converges towards the line of the opposite side ; another band 

 proceeding from under the posterior edge of the mantle, not quite con- 

 tinuous with the above described line, runs along the sides of the body 

 to its extremity. Body cylindrical, narrow, when extended very much 

 elongated, expanding a little towards its extremity, and ending in a flat 

 and rounded termination ; its upper surface is covered with narrow, 

 oblong, prominent glands, appearing sometimes as if carinated, and 



Fig. 492. 



Arion fuscii^. 



arranged in parallel rows, the flanks with elongated tuberculated plates 

 and finer granulations. Head darker than the body, projecting very little 

 beyond the mantle. Eye-peduncles blackish, one-eighth the length of the 

 body, stout, bulbs translucent, ocular spot at the superior part, black. 

 Tentacles immediately under the eye-peduncles, very short, coniciil. 

 Mantle small, oval, narrow, commencing just behind the insertion of the 

 eye-peduncles, less than one-third of the length of the animal ; covered 

 with granulations tending to a vermiform shape. Disk of the foot 

 whitish, without a separate locomotive band, the marginal boundary 

 between it and the body marked by a furrow, projeiting beyond the 

 body posteriorly. Respiratory foramen small, with a cleft to the margin 

 of the mantle. Between the eye-peduncles is a tubercular ridge with 

 furrows on each side. The triangular mucus pore is on the upper surface 

 of the posterior extremity, is very apparent, and has a process of the skin 

 which seems to cover it, and sometimes to project above it. When fully 

 grown, the extreme length is more than 50, its usual length about 25 mill. 

 Internal granulations coarsely united or aggregated into a somewhat 

 ovular, semitransparent, very granular plate. 



Limax fuscus, Mijller, Hist. Verm. II, 11 (1774). 



Arion hortensis, FisBussAC, Hist. 65, pi. ii, f. 4, 6 ; Suppl. p. 96 a (1819). 

 — BiNNEY, Bost. Journ. Nat. Hist. IV, 170 (1842) ; Terr. Moll. II, 

 27, pi. Ixiv, f. 1 ; Ixv, f. 2 (1851).— Leidy, T. M. U. S. I, 249, pi. ii, 

 f. 1-4 (1851), anat.— DeKay, N. Y. Moll. 23 (1S43).— Reeve, Brit. 

 L. and F.-W. Moll. 11, fig. 



Arion /uscus, Moqoix-Tandox (which see for further for( ign synonyms). 



