360 Xortli American Species of Zonites, etc. 



Dr. Lewis, and find them to be rather a variety of gularis — one 

 of the many curious forms of that variable species. The internal 

 tooth-like processes, strongly curved one towards the other, form 

 almost an arched space. On pi. XV, fig. C, will be found a 

 figure of this form. Dr. Lewis's specimens were from Munroe 

 Co., Tenn. (Miss Law). I have also received it from Eoan 

 Mountain. X. G. (Mrs. (f. Andrews). 



Tet>ennoplioru§, . 



From Dr. W. Newcomb I have received a slug which, from its 

 outward characters, jaw and lingual membrane, surely is a spe- 

 cies of Tebennopliorus. It is mentioned here, as the locality is 

 new for the genus — Brazil. 300 miles up the river from Para. 



Mesodon dentifera, Binn. 



Vermont. 



On'pl. XIV, fig. G-, I have figured the genitalia of this species, 

 hitherto unknown. 



The genital bladder {g. b.) is small, oval, on a short duct 

 which is greatly swollen at a short distance below the bladder : 

 the penis-sac (p. s.) is long, stout and contracted, at a short dis- 

 tance below its blunt end : the retractor is inserted in the vas 

 deferens at about the middle of its length. 



In another individual, the construction of the penis-sac was 

 not so well developed. 



Mcsotion Andrewsi, n. sp. 



At Roan Mountain, Mitchell Co., X T . C, Mrs. Andrews col- 

 lected numerous specimens of a Mesodon which cannot be referred 

 to any known species. 



Shell imperforate, globose, very thin, with delicate wrinkles of growth 

 and microscopic revolving striae ; horn-color ; spire elevated, conic, apex 

 obtuse ; whorls six, convex, the last greatly swollen ; peristome white, 

 thickened, slightly reflected, ends separated, the columellar one expanded. 

 Greater diameter 25 mill., lesser 20 ; height 14 (Plate XV, Fig. L). 



The absence of limestone on Roau Mountain accounts for the 

 extreme thinness of the shell. 



It can scarcely be said to resemble closely any known species 



