MUSEUM OF COMPARATIVE ZOOLOGY. 141 



Shell broadly umbilicate, depressed ; subglobose, thiii, shining, translucent, 

 whitish, irregularly striated ; suture moderately impressed ; whorls 5^6, 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, 5-5j mm. ; height, hardly 3 mm. 



/Unites petrophilus, Bland, Ann. N. Y. Acad. Sci., Vol. II., Fig., p. 369 (1883). 



The Cliff's, Knoxville, Tennessee, found with Z. JFheatlcTji, Mrs. George 

 Andrews. 



This species is, in general form, nearly allied to Z. arboreus, but the color is 

 different, the striae are more developed, and the umbilicus is nmch 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, Bland. 



Plate I. rig. G. 



T. umbilicata, depressa, tenuis, nitens, pellucida, fusculo-cornea, delicata 

 striatula ; spira subplanulata ; sutura leviter impressa ; anfr. 4^, 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, jomed by a 

 thin callus. 



Greater diameter, 5 mm. ; lesser, 3^ mm. ; height, 2 mm. 



Zonites Wheatleyi, Bland, Ann. N. Y. Acad. Sci., Vol. II. p. 368, 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 



