246 A MANUAL OF AMERICAN LAND SHELLS. 



ence sufficiently great to raise a doubt of the specific identity of the 

 two specimens. The central teeth have a base of attachment longer 

 than wide, with short lines of reinforcement running j^arallel to the 



Fig. 262. 



Lingual dentition of T. dorsalis. 



outer edges at the lower margin. The upper margin is reflected. The 

 reflection extends about one-third of the length of the base of attach- 

 ment; 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 centrals, but asymmetrical 

 by the suppression of the inuer cusp and cuttiug i^oint, and inner, 

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

 teeth are low, wide, broadly reflected, the reflection equaling 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. 



Tebennopliorus Wetlierbyi. 



From near the mouth of Laurel River, Whitley County, Kentucky, 

 Mr. A. G. Wetherby collected many specimens of what appeared to be 

 a small species of Tebennopliorus. It was readily distinguished from 

 the numerous young of T. Caroliniensis found in the vicinity by the ar- 

 rangement of the blotches of color, they being in irregular, interrupted, 

 transverse bands, instead of running longitudinally, as in that species. 

 The anterior portion of the body seemed also to be more swollen and 

 the posterior extremity to taper more rapidly than in Caroliniensis. On 

 examining the jaw I found it to be ribbed. The presence of ribs was 

 verified in four individuals. Small specimens of T. Caroliniensis from 

 the same locality had the usual ribless jaw of that species. I have 

 named it after its discoverer. It is difficult to draw more satisfactory 

 specific characters from specimens preserved in alcohol. One of them, 

 in its contracted state, measures 12"™ in length. Subsequently I re- 

 ceived specimens in which the blotches run longitudinally. 



