EASTERN PROVINCE — INTERIOR REGION SPECIES. 



281 



VITRIIVIZONITES. 



Animal of V. latissivius. 



Animal heliciform, bluut before, iu motion greatly acuminated be- 

 hind ; mantle subcentral, jjrotected I'le. 253. 

 by an external shell ; two longitudi- 

 nal furrows above the margin of the 

 foot, meeting over a rounded caudal 

 mucus pore ; distinct locomotive disk 

 to foot; external orifice of combined 

 generative organs on right side of body, far behind the right eye- 

 peduncle; of respiratory and excretory organs on the right. of the 

 mantle, under the peristome of the shell ; jaw smooth, with median 

 projection ; lingual membrane* as in Zonites. 



Shell external, Vitrina-like. 



The genus differs from Vifrina in having simple, not bifid, marginal 

 teeth to the lingual membrane, by its caudal pore, and by the want of 

 an appendiculate mantle. From Zonites it diifers in the form of the shell 

 and by the character of the caudal pore, being circular, not longitudi- 

 nal, with projecting process when open. 



Thus far known only by F. latissimus of mountains of ]!^orth Carolina 

 and Tennessee. 



Titrinizoiiites latissiuius, Lewis. 



Shell vitrinaform, very much depressed, thin, fragile, translucent, 

 polished; suture deeply impressed; whorls 2, very rapidly F1G.254. 

 expanded, with delicate lines of growth and quite con- 

 spicuous, separated, deeply impressed, arcuate, transverse 

 lines, and crossed by a few microscopic, impressed, re- 

 volving lines; aperture nearly equal to half the area of the 

 base of the shell, very oblique, a&ymmetrically ovate; 

 peristome thin and acute, flexuose above, and at the colu- 

 mellar origin arising from the axis of the shell; axis imperforate; color 

 of the shell amber-brown. Transverse diameter, 17.3'"'"; lesser diame- 

 ter, ll.O'""'; height, 7.1"™. 



Tennessee Bald Mountain, G,COO feet. Miss Law; Roan Mountain, 

 North Carolina, Mrs. G. Andrews; Thunderhead. From Blount County 

 to Carter County, Tennessee, in the mountains dividing the State from 

 North Carolina. Also found by Mr. Hemphill on the Nantehelah Mount- 



T. latibi,unu)i 



See Bull. Mus. C. Z., No. 16, pi. ii, fig. H., and ante p. 56. 



