LOCALLY INTRODUCED SPECIES. 461 



Arion fuse us, Mt]rLLER. 



Color whitish or light ashy, sometimes with a tinge of brown or 

 dark grayish ; an obscure, nc 502. 



ill-defined, dark-colored 

 line or band rises where 

 the mantle meets the base 

 of the eye-peduncles, on ^"^=^4^5^^^^ 



both sides, and, extending Arion/uscus. 



along the wliole length of the mantle to its posterior extremity, con- 

 verges towards the line of the opposite side ; another band, proceed- 

 ing from under the posterior edge of the mantle, not quite continuous 

 with tlie above-described line, runs along the sides of the body to its 

 extremity. Body cylindrical, narrow, when extended very much elon- 

 gated, 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 

 arranged in jiarallel rows, the flanks with elongated, tuberculated 

 plates and finer granulations. Head darker than the body, jirojecting 

 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, conical. Mantle small, oval, narrow, commencing just 

 behind the insertion of the eye-peduncles, less than one-third of the 

 length of 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, 

 projecting beyond the body posteriorly. Eespiratory foramen smali, 

 with a cleft to the margin of the mantle. Between the eye-peduncles 

 is a tubercular ridge, with furrows on each side. The triangular mu- 

 cus 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""", the usual length about 25™™. Internal granu- 

 lations coarsely united or aggregated into a somewhat ovular, semi- 

 transparent, very granular plate. 



Limax fuscm, Mullkr, Hist. Venn., ii,ll (1774). 



Arion horteiihix, Fekussac, Hist., 6.'), pi. ii, figs. 4, 6; Snppl., 96, a (1819). — Bixney, 

 Bost. Jonru. Nat. Hist., iv, 170 (1842); Terr. Moll., ii, 27, pi. lxiv,fig. 1; Ixv, 

 fig. 2 (1«.51).— LEiDy,T. M. U. S.,i,249, pi. ii, figs. 1-4 (1851), anat.— De Kat 

 N. Y. Moll., 23 (ld43).— Reeve, Brit. L. &. Fr.-W. Moll., 11, fig. 



