34- Cincinnati Society of Natural History. 



nati Southern Railroad, and Elk river in Franklin count}', Tennessee. 

 It has not 3'et been found b}' me in the Central Valley' of Tennessee, 

 but it reappears again in the dr;- forests west of the valle}- in Hardin 

 and Wayne counties. 



In Terrestrial Ilollusks, vol. v., in remarks under this species, it is 

 asserted that " in harhigera the attached hair-like epidermidal process- 

 es are produced, at the sutures and carina, into cilia, which are entirely 

 wanting in this species." This is often the case in old or poorl}^ pre- 

 served specimens, but in good, mature, well conditioned examples, the 

 fringes of the sutures and carina are as well shown as in H. harhigera. 

 Not onl}^ so, but in collecting large numbers of the latter species, we 

 find comparatively' few so well preserved as to show the fringe around 

 the carina, which is characteristic not only of these two species, but 

 also of the H. spinosa and //. edgariana. A variety' of this shell, in- 

 habiting open, wooded pastures, near Somerset, Kentuck}-, is much 

 larger than the normal type, and bears a very close resemblance to H. 

 harhigera, at first glance. 



H. (Stenotrema) stenotrema^ Sa}'. — This species has the same 

 southern distribution as the last, and a wider one to the north and 

 west. A variety- occurs on the Cumberland Plateau, in Franklin 

 county, Tennessee, which has the spire unusually elevated, and the base 

 abnormally convex below. The t3'pical form more nearly resembles 

 that of the large variet}' of IT. hirsuta mentioned above. The two forms 

 approach each other so closely that the}' have been confounded. ]Mr. 

 Binney, in Terrestrial Mollusks, vol. v., quoted above, says, "the form 

 of the parietal tooth, however, varies in hirsuta^ from which this species 

 can chiefl}', if indeed not alone, be distinguished b}^ the size and posi- 

 tion of the notch." 



These two species, hirsuta and stenotrema, v,'it\i their varieties, form 

 a seri'es of differentiations that would be reduced to one species by the 

 same treatment which has brought other shells less closely united 

 under the same S3'non3'm3'. 



H. (Stenotrema) edgariana, Lea. — This rare species occurs in Ten- 

 nessee, not far from the line of the Cincinnati Southern Railroad, and 

 the locality' furnishes specimens in a most beautiful state of preserva- 

 tion. The shell differs from the II. sj^inosa. Lea, with which it has 

 been confounded, in the following prominent characters. It is smaller, 

 more solid, with a much more elevated spire, and more convex base. 

 The whorls are more rounded, and there is no evidence of the 

 peripheral overlap which, in the H. spinosa, gives the edge of each 

 whorl, in perfect specimens, a transparent, corneous-looking margin. 



