250 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



lower margin. The upper margin is reflected. The reflection extends about 

 one third of the length of the base of attachment ; it bears a central, stout, 

 well-developed cusp, and one small, little-developed, rounded cusp at each side ; 

 all three cusps have stout cutting points. The lateral teeth are like the cen- 

 trals, but asymmetrical by the suppression of the inner cusp and cutting point, 

 and inner, lower, lateral expansion of the base of attachment. The marginal 

 teeth are low, wide, broadly reflected, the reflection equalling the length of 

 the base of attachment, and very irregularly denticulated, there being usually 

 one long, blunt, oblique, inner, bifid cutting point, the outer division much the 

 shorter, and several short, blunt, outer cutting points. 



Pallifera dorsalis, Binney. 

 Vol. III. PI. LXIU. Fig. 3. 



Color of upper surface ashy, with a shade of blue, an interrupted black line 

 extending down the centre of the back ; eye-peduncles black, about one eighth 

 of the length of the body ; tentacles blackish, very short. Body cylindrical 

 and narrow, terminating posteriorly in an acute point ; base of foot white, very 

 narrow, its separation from the body not well defined. Upper surface covered 

 with elongated and slightly prominent glandular projections, the furrows be- 

 tween indistinct. Respiratory orifice very minute, situated on^the right side, 

 about one eighth of an inch behind the insertion of the eye-peduncle. The 

 mantle is closely connected with the body. Length, 1,8 mill. 



Philomycus dorsalis, Binney, Bost. Journ. Nat. Hist., IV. 174 (1842) ; Proc. 



Bost. Soc. Nat. Hist., 1841, 52. — Adams, Shells of Vermont, 163 (1842). — 



Gray k Pfeiffer, Brit. Mus. Cat, 159. — Tryon, Am. Journ. Conch., III. 



317 (1868). 

 Limax dorsalis, DeKay, N. Y. Moll., 22 (1843). 

 Tebennophorus dorsalis, Binney, Terr. Moll., II. 24, PL LXIII. Fig. 3 (1851). — 



W. G. Binney, Terr. Moll., IV. 31 ; L. & Fr.-W. Sh., I. 301 (1869). — Gould 



and Binney, Invert, of Mass., ed. 2, 460 (1870). 

 Pallifera dorsalis, Morse, Journ. Portl. Soc, I. 8, Fig. 5 ; PI. III. Fig. 6 (1864). 



Vermont, Massachusetts, New York, thus appearing a species of the North- 

 ern Region. From Kentucky I have received specimens of this or an allied 

 species ; it may therefore extend into the Interior Region. 



This animal is found in woods and forests, in the soil under decaying trunks 

 and logs. It is lubricated by a watery mucus which is not secreted in quantity 

 sufficient to preserve its life when removed from its native haunts and exposed 

 to the air. It is even difficult to preserve it long enough for examination, as 

 it becomes dry, diminishes in bulk more than one half, and dies. We have 

 seen many specimens. They were very active in their movements, and one of 

 them suspended itself by a thread of mucus, in the manner of the Limaces. It 

 sometimes climbs trees. Our specimens were found in Vermont. Dr. Gould 

 has recognized this or a similar species near Boston. 



