MOLLUSCA. LiMAX. 3 



presenting two long and two short tentacula, the surface somewhat 

 granular or regularly wrinkled ; and on the back is a shield-like 

 mantle, on the right side of which we see a notch opening into the 

 respiratory cavity. They are found under decaying logs, and under 

 bits of wood or stones in damp places, where they feed upon the 

 decaying vegetable matter to which they have direct access. 



They can scarcely be said to be destitute of a shell ; for they 

 have a minute, thin, nail-like shell, concealed under the front part 

 of the mantle. 



I have observed two species, neither of which has been de- 

 scribed, so far as I have been able to ascertain. One of them 

 may be called 



LiMAX togdta. It is two inches or more in length, and the 

 shield extends quite back to the extremity of the animal, envel- 

 oping the whole animal except the head ; the respiratory notch is 

 near the front ; the surface of the shield is neither granulated nor 

 folded, but exhibits a uniform, rough appearance, somewhat like 

 deer-skin ; its margin is light fawn-color, the back is a dark pur- 

 plish slate-color, and the sides are mottled with the two colors ; 

 the foot is wrinkled across, and is of a darker tint than the sides. 

 It is very commonly found in woods, on turning over prostrate 

 logs. 



It is very probable that the great developement of the shield, 

 and its peculiar surface, with other peculiarities, which the con- 

 tracted state of my specimens will not allow me to perceive, may 

 entitle this animal to be regarded as a new genus. The L. Caro- 

 liniensisj Bosc, is an allied species. Ferussac coincides with 

 the above opinion. 



LiMAX tunicata. This is a smaller, sub-cylindrical species, 

 about /„ of an inch in length, when extended, and about y\ 

 in width. The color varies from dark drab to dusky brown, and 

 almost to black. The shield is short, rounded behind, its surface 

 with conspicuous, interrupted, concentric wrinkles, the respira- 

 tory notch rather behind its middle. The neck is smooth, with 

 an elevated, central line. The back behind the shield is marked 

 with broken wrinkles, arranged lengthwise. The upper tentacula 

 are granulated and black at their tips. Foot very narrow. 



