1902.] NATURAL SCIENCES OF PHILADELPHIA. 437 



base decussated by many impressed spirals (fig. 8j. The interual 

 lamella; are loug, as iu the youug of other forms of the fjularis 

 group. 



Most abundant on :Mt. Mitchell, the type locality. Fouud also 

 at Tyson's, Wilson's, Potato Top, Cat-tail, Ivy river, Bee Tree 

 Cove and Bluff mountain. 



This variety was first recognized several years ago l)y ^Ir. 

 Vanatta and one of the present writers, among specimens collected 

 by Mr. Hemphill, labeled " Black Mis., N. C." The specimens 

 were fouud with G. gularis theloides. On account of the small 

 number of specimens (two adult and one young), it was not defined 

 at that time. The abundant material taken iu 1901 places the 

 subspecies upon a secure basis. It differs from G. gularis and the 

 racial forms subordinated to that species in the strong sculpture, 

 comparatively dull surface, the decussation and acute carination of 

 the youug shells, and the short, high, erect lamella of the adult 

 stage. Compared with G. collkella Pils. , the var. decussata is seen 

 to differ iu the closer and flat whorls of the spire, flattened instead 

 of swollen base, carinate periphery, etc. Young shells resemble 



G. intertexta in sculpture. 



Gastrodonta interna (Say). 



Common on both sides of the river at Paint Kock and at Tyson's. 



A few were also taken on Potato Top, Cat-tail and iu Bee Tree 



Cove. 



Gastrodonta andrewsae (W. G. Binney). 



Very abundaut on Potato Top and not uncommon on Mt. 



Mitchell and Bluff mountain. A few were also taken on Cat-tail 



and at Bee Tree Cove, Toe river and at Paint Kock, on the south 



side of the river. One specimen from this last locality has the 



teeth fused together, forming a continuous rib across the cavity of 



the shell as in G. lamellidens. 



Gastrodonta lamellidens Pilsbry. 



A single specimen was taken on Bluff mountain, and another on 



the Toe river side of the Pinnacle of the Blue ridge. 



PHILOMYOID^. 

 Philomycus carolinensis (Bosc). 



Not so abundant as in the Great Smoky mountains. A few only 

 were seen on Blutf mountain and Mt. Mitchell. 



