MUSEUM OF COMPARATIVE ZOOLOGY. 141 
Shell broadly umbilicate, depressed ; subglobose, thin, shining, translucent, 
whitish, irregularly striated ; suture moderately impressed ; whorls 54-6, rather 
convex, the last more convex, not descending ; umbilicus widely excavated 
externally, pervious ; aperture roundly lunate; peristome simple, somewhat 
thickened, often rose-colored, the columellar margin slightly reflected. Diam- 
eter, greater, 6mm. ; lesser, 5-5} mm.; height, hardly 3 mm. 
Zonites petrophilus, Buanp, Ann. N. Y. Acad. Sci., Vol. II., Fig., p. 869 (1883). 
The Cliffs, Knoxville, Tennessee, found with Z. Wheatleyi, Mrs. George 
Andrews. 
This species is, in general form, nearly allied to Z. arboreus, but the color is 
different, the strize are more developed, and the umbilicus is much wider. 
My friend, Mr. W. G. Binney, examined the dentition of Z. petrophilus, 
and favored me with notes on the subject. He found the teeth 15-1-15, with 
two perfect laterals, one only on each side. Z. viridulus has the same number 
of laterals, but many more marginals. 
I would express my deep obligation to Mrs. Andrews for her uniform kind- 
ness and liberality in supplying me, during many years, with numerous rare 
and interesting species. (Bland.) 
Fac-similes of the original figures are given on PI. I. Fig. F. 
Zonites Wheatleyi, Buanp. 
Plate I. Fig. G. 
T. umbilicata, depressa, tenuis, nitens, pellucida, fusculo-cornea, delicata 
striatula; spira subplanulata; sutura leviter impressa; anfr. 43, convexius- 
culi, ultimus basi convexior, ad aperturam rapide accrescens, vix descendens ; 
umbilicus pervius ; apertura depressa, oblique lunaris; peristoma simplex, 
acutum, marginibus approximatis, callo tenui junctis. 
Shell umbilicated, depressed, thin, shining, pellucid, brownish horn-colored, 
finely striated ; spire subplanulate ; suture slightly impressed ; whorls little 
convex, the last more convex at the base, rapidly increasing at the aper- 
ture, scarcely descending ; umbilicus pervious; aperture depressed, obliquely 
lunate; peristome simple, acute, the margins approximating, joined by a 
thin callus. 
Greater diameter, 5 mm. ; lesser, 3} mm. ; height, 2 mm. 
Zonites Wheatley’, Buanp, Ann. N. Y. Acad. Sci., Vol. II. p. 868, Fig. 1 (1883). 
The Cliffs, Knoxville, Tennessee, Mrs. George Andrews; also, Tiverton, 
Rhode Island, J. H. Thomson. 
This, with the following species (petrophilus), was discovered and communi- 
cated to me, in 1879, by Mrs. Andrews, who thus described the locality in 
which the two species were found: “The Cliffs rise up 200 feet on the south 
side of the river; they are very steep and rocky, face the north, are almost 
