LIMAX. 407 



Canada to Georgia, Michigan to Missouri ; also the post-pleio- 

 cene of the Mississippi Valley. 



Oenus LIIflAX, Liv. 1740. 



Body lessening towards the posterior extremity, which terminates 

 in a point. Back with a carina or keel when contracted, convex 

 when extended. Integuments with longitudinal elongated glands, 

 and anastomosing furrows arranged in the same manner upon both 

 sides. Mantle anterior, oval, marked with fine concentric strife, or 

 prominent wrinkles, unattached and free at the front and sides, but 

 connected with the body at its posterior part, and containing in this 

 part a testaceous rudiment or shell. Locomotive disk not expanded 

 at margin, having a narrow band running longitudinally along its 

 centre, and separated from the sides by a well-defined line or fur- 

 row. Respiratory orifice near the posterior margin of the mantle, 

 large. Anal orifice immediately adjacent to, but a little above and 

 anterior to the respiratory orifice, with a cleft or fissure through the 

 mantle from the orifice to its edge. Orifice of organs of generation 

 near and immediately behind the right superior eye-peduncle. 



Testaceous rudiment thin, concentrical, not spiral, covered above 

 with a thin and transparent periostraca, below smooth. 



Jaw without ribs or marginal denticulations, its concave margin 

 with a median projection. 



Lingual membrane very Ijroad, teeth long, central tricuspid, lat- 

 erals of the same shape, but bicuspid ; uncini aculeate. 



Limax maximus. 



Limax maximu!^, Lin. Syst. Nat. 



Linuix untiquonim, Ferussac, Podi-. 20; Hist. 68, pi. 4, pi. 8 A, fig. 1. 



Color liglit brown or ashen with alternate longitudinal rows 

 of round spots, and uninterrupted stripes of black along the back 

 and sides, replaced hj irregular blotches on the mantle ; lighter 

 on the sides, dirty white below ; eye-peduncles and tentacles short, 

 blackish. Body elongated, terminating in a well-marked dorsal 

 carina ; covered with coarse, elongated, longitudinal tubercles ; con- 

 stantly exuding mucus from its wdiole surface, giving a vermicular, 

 glistening effect. Mantle large, bluntly oval, with tuberosities more 



