1902.] NATURAL SCIENCES OF PHILADELPHIA. 419 



Gastrodonta capsella. Philomyciis hemphillii. 



Gastrodonta cajisella placentula. Succinea ovalis, 

 Gastrodonta lamellidens. 



are all toiuid on the summits of the Smoky mouutains aud nearly 

 all of them ou Mitchell or Bluff mountain. 



Of the remainder, Pohjgijra andrewsce is the characteristic species 

 of Mt. jNlitchell, and Polygxjra altispira and Gastrodonta andrewsce 

 Avere found generally distributed in the French Broad region, so 

 that Polijgyra suhpaUiata, Omj^halma rugeli, Gastrodonta coelaxis 

 and Philomycus wetherbyi are really the only species peculiar to the 

 Roan summit. 



Upon the higher levels of the Smoky mountains, on the other 

 hand, we find a larger number of peculiar species which do not 

 seem to extend so far north as the French Broad. These are : 



Polygyra ferrissii. Omplialina andrewsce montivaga. 



Polygyra clarkii. Vitrinizoiiites lasitismiis. 



Vitrea petrophila. Vitrinizonites uvidermis. 

 Vitrea pentadelphia. 



The apparent poverty of the higher peaks of the French Broad 

 region in peculiar species was both a surprise and a disappointment. 

 The probability that Mt. Mitchell, the giant of them all, would at 

 least furnish a rival to the beautiful Polygyra ferrissii seemed so 

 great, that the failure to find one was scarcely compensated by the 

 rediscovery of the rare little Vitrea clingmani Dall. This seems 

 to be the only species peculiar to jNIt. ^Mitchell, and the expedition 

 felt like engraving on its highest pinnacle the old proverb: "montes 

 parturiunt, nascitur ridiculus mus." 



The following list of all the species known from the mountain 



region lying between Roan mountain and the Little Tennessee river 



will show the general range of each species in the three districts 



,that have been explored, upon which the foregoing remarks have 



been based : 



