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INTRODUCTION. 
" P . oxurus. Fulvous gray, slender, back wrinkled 
longitudinally ; tentacula brown, the lateral ones very small ; 
tail acute, carinated above. Length two thirds of an inch, 
in New York. 
" P . fuscus. Entirely brown, tentacula thick, back 
smooth, tail compressed, acute. In Ohio, length one fourth 
of an inch. 
" P .fcxuolarh. Fulvous, back variegated, with flexu- 
ose brown lines, slightly wrinkled transversely ; attenuated 
behind, tail obtuse. Length from one to two inches, it 
may change its shape. Found on the Catskill mountains. 
There are many other species of this genus in the United 
States. 
GENUS EUMELUS. 
ErJiELtrs. " Differs from Limax by no visible mantle, the 
four tentacula almost in one row in front and cylindrical, 
nearly equal, the smallest pair between the larger ones. 
Name mythological. 
" Eumelus nebulosas. Body nearly cylindrical, rounded at both 
ends ; back smooth, crowded with gray and fulvous spots 
intermixed of the same tinge, without spots beneath ; tenta- 
cula brown. Length about one inch, in Ohio and Kentucky. 
" E . livitlus. Livid brown above, grayish beneath, anten- 
nae black, obtuse behind, back smooth and convex. Length 
one inch, in Ohio, Indiana, and Kentucky. 
GENUS HEMILOMA. 
Hemiloma. (Univalve Land Shell.) "Spire raised and 
smooth : opening obliqual elliptic, with an anterior raised 
half margin on the inside lip, a little twisted ; columella 
