EASTERN PROVINCE INTERIOR REGION SPECIES. 223 



A species of the Cumberlaud Subregiou ; the Olifl's, Kuoxville, 

 Tenn., Mrs. G. Andrews. It is also said to be found at Tiverton, E. I., 

 which indicates its belonging to the whole Interior Eegion. 



More nearly allied to Z. viridulus than to any other North American 

 form, but differs from it especially in the form of the aperture, in the 

 descending last whorl, and in having a wider umbilicus. (Bland.) 



Specimens collected by Mr. Henry Hemphill at Clingham's Peak, N. 

 C, are very much larger than the type, measuring 9™™ in greater di- 

 ameter. 



The lingual membrane is as usual in Zo7iites. There are on each side 

 of the central tooth two perfect laterals, one intermediate, and fifteen 

 marginals. 



Zoiiites petrophilus. Bland. 



Shell broadly umbilicate, depressed, subglobose, thin, shining, trans- 

 lucent, whitish, irregularly striated ; suture moderately 

 impressed ; whorls 5^-G, rather convex, the last more con- 

 vex, not descending ; umbilicus widely excavated exter- 

 nally, pervious; aperture roundly lunate; peristome simple, 

 somewhat thickened, often rose-colored, the columellar 

 margin slightly reflected. Greater diameter 6, lesser 5- 

 5^™'°; height, hardly S^^-". 

 Zonites petrophilus, Bland, Ann. N. Y. Ac. Sc, ii, 369 (1883). 



The Cliffs, Knoxville, Tenn., Mrs. G. Andrews; Haber- ^-p^^'""?''""*- 

 sham County, Ga., and Clarkesville, N. C, by Mr. H. Hemphill ; a spe- 

 cies of the Cumberland Subregion. Allied to Z. arboreus in general 

 form, but the color is different, the strife are more developed, and the 

 umbilicus is much wider. (Bland.) 



Lingual membrane as usual in Zonites. Teeth 15-1-15, with 1 lateral 

 on each side. 



Subgenus GASTEODONTA, Albers. 



Animal (of Z. suppressus) bluish-black, darker on the head, eye- 

 peduncles, and neck ; eye-peduncles long and filiform ; ten- ^^^ ^g^ 

 tacles short. Length twice the diameter of the shell. On 

 the upper surface of the extremity of the foot is the mucus 

 pore, a longitudinal fissure or furrow, from which mucus Tail of z<mitcs 



suppressux, 



exudes in great quantities, and which the animal shuts enlarged. 

 and closes at will. A distinct locomotive disk and longitudinal furrows 

 above the margin of the foot. 



