108 THE NAUTILUS. 



that there is probably no sharp line of demarcation anywhere. It is 

 found, however, that the French Broad river region has itself some 

 of the characteristics of a distinct faunula, although Mt. Mitchell, the 

 centre of the explorer's hopes, proved disappointing. A comparative 

 list, showing the distribution of the species, is presented on pp. 420, 

 421. To the Roan Mountains list should be added Philomycus 

 secretus, described from thence, and Vitrea carolinensis wetherbyi, 1 

 sent to the present writer from Roan Mountain by Wetherby. The 

 true V. carolinensis probably does not occur at Roan Mountain, as 

 I gathered from Wetherby's letter when sending the wetherbyi, that 

 he knew only the latter. 



Leaving out a few probably erroneous records, we find 105 species 

 and races of land mollusca recorded from the whole region discussed. 

 Of these, only 33 are recorded as common to all three faunulae, i. e., 

 the Roan, F'rench Broad and Great Smoky. Three are common to 

 the Roan and Great Smoky regions, and have very likely been over- 

 looked in the French Broad. 25 are from the Roan alone, 10 from 

 the Roan and French Broad, 8 from the French Broad alone, 7 from 

 the French Broad and Great Smoky and 19 from the Great Smoky 

 alone. 



The same peculiar features of the fauna as were observed in the 

 Great Smokies are seen in the Mt. Mitchell region. The Pupidae 

 are represented by a single example of Strobilops, and this a southern 

 form. Not a single Limnasid was found anywhere ; not even Physa. 



The new forms described in the paper are : Polygyra tridentata 

 tennesseensis W. & P., P. andrewsa intermedia W. & P., Vitrea ap- 

 proxima W. & P., V. vanattai P. & W., Gastrodonta gularis theloides 

 A. D. Brown MS., and G. gularis decussata Pils. & Van. ; while 

 Polygyra hirsuta vars. altispira and pilula are raised to specific rank. 

 Pyramidula alternata mordax was rediscovered by the expedition, 

 and is fully discussed and figured. 



Altogether, the paper is certainly a most satisfactory one, and we 

 can only hope that it will be followed by a long series of similar ones. 

 It will be some time before Messrs. Pilsbry, Walker, Ferriss and 

 their friends exhaust the possibilities of the Appalachian Mountains, 

 which seem to contain an extraordinarily varied and interesting mol- 

 luscan fauna. T. D. A. COCKERELL. 



1 On page 430, the date of publication of wetherbyi is said to be 1901. It 

 should be 1900. 



