66 LAND AND FRESH-WATER SHELLS OF N. A. [PART J. 



peduncles smoky ; body cylindrical, elongated, terminating in a very short 

 carina at its posterior extremity ; mantle oval, fleshy, but little prominent, 

 with fine concentrical lines ; back covered with 

 prominent elongated tubercles and furrows ; foot 

 narrow, whitish ; respiratory foramen on the 

 posterior dextral margin of the mantle ; body 

 covered with a thin, watery mucus. Length, 

 Liriiax campestris. abOUt Zo mill. 



Limax campestris, Bixney, Proc. Bost. Soc. 1841, 

 52; Bost. Journ. Nat. Hist. IV, 169 (1842); Terr. Moll. 11,41 pi. 

 Ixiv, f. 3.— Adams, Shells of Vermont, 163 (1842).— DeKay, N. Y. 

 Moll. 23 (1843).— Leidy, T. M. U. S. I, 250, pi. ii, f. 5, 6 (1851), anat. 



Inhabits all the New England, Middle, and "Western States, 

 and is probably widely diffused through the country. 



The resemblances between some of the species of this genus 

 are so great that it is difficult to provide them with distinctive 

 characters, and it is only by close comparison that their differences 

 can be seen. The present species, although considerably smaller, 

 is nearly allied to Limax agrestis. 



Its differential characters are as follows : It is always much 

 smaller, and at all ages possesses a peculiarly gelatinous or semi- 

 transparent consistency. The tuberosities of the surface are 

 more prominent in proportion to their size, are not flattened 

 or plate-like, and are not separated by darker colored anasto- 

 mosing lines, the intervening furrows being of the same color as 

 the general surface. It does not secrete a milky mucus at every 

 part of the surface when touched. Like that species, it is active 

 in its motions, and suspends itself by a thread of mucus. 



This species appears to be common to all the northern parts 

 of the United States. It is found under decaying wood in the 

 forests and in open pastures, and under stones at road-sides. 

 From its wide distribution, it would seem to be indigenous. 



Its testaceous rudiment is minute and delicate in proportion to 

 the small size of the animal. 



Spurious Species of Limax, &c. 



Limax marmoratus, DeKay. See Tebennophorus caroliniensis. 

 Limax columhianus, Gould, I have referred to ArioVimax. 

 Umax fuliginosus, Gould, and 



Limax olivaceus, Gould, are erroneously referred to America by Grate- 

 loup (Distr. Geog. Lim. p. 30). 



