ZONITES. 203 



probably be better to retain Dr. Binney's widely known and 

 accepted name. 



" Albers states that H. apex, Adams, cannot be united with 

 minuscula, being distinguished by its size and by fine spiral 

 sculpture. A nearer relative of H. apex is H. hypolepta, Shut- 

 tleworth, 1854. The diagnosis of Microphysa, which, on the 

 whole seems poorty, if at all, distinguished from Hyalina, pre- 

 cludes the inclusion with it of such shells as Conulus Stearnsi, 

 Bland, and Gastrodonta (?) Lansingi, Bland, as Mr. W. G. Binney 

 has recently suggested. The more we learn about the characters 

 of the soft parts, shells, and dentition of these land shells, the 

 more evident it becomes that many of these groups are unne- 

 cessary, and might better be dispensed with. The series inos- 

 culate on every side." 



IT. MILIUM, Morse. PL 60, figs. 64, 65. 



Widely umbilicnted, depressed, transparent, shining, greenish 

 white, distinctly striate, and with microscopic revolving lines 

 more conspicuous below ; whorls 3, rounded, rapidly increasing, 

 the last planulate above. Diam. 1/5 mill. 



Maine, Massachusetts, Kentucky, California. 



" The surface is raised in numerous rib-like folds, frequently 

 anastomosing ; longitudinal ribs reticulate the surface and 

 render the folds so crenulated, that in certain lights the shell 

 appears as if ornamented with strings of beads. This peculiar 

 character disappears at the base of the shell, and is replaced by 

 revolving lines and regular lines of accretion." BINNEY. 



o ~ 



II. EXIGUA, Stimpson. PL 60, figs. 66, 67. 



Widely umbilicated, depressed, pellucid, greenish yellow, with 

 delicate revolving lines, and distant oblique longitudinal ribs ; 

 whorls 3jr, convex. Diam. 2 '5 mill. 



Canada, New England to Minnesota. 



It is H. annulata, Case. 



H. CONSPECTA, Bland. PL 60, fig. 68. 



Moderately umbilicated, subdepressed, thin, with oblique, 

 rather distant, rib-like stria?, the interspaces microscopically 

 striate, dark horn-color ; whorls 4, convex, gradually increasing, 

 with deep suture. Diam. 2 mill. 



Alaska to California, Cunningham Gulch, Colorado. 



