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 poorly, 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 recentl}' 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 man t y of these groups are unne- 

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

 culate on every side." 



H. MILIUM, Morse. PI. 60, figs. 64, 65. 



1 JL Widely umbilicated, depressed, transparent, shining, greenish 

 Avliite, distinctly striate, and with microscopic revolving lines 



p^ more conspicuous below ; whorls 3, rounded, rapidh' 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- 



j* H. EXIGUA, Stimpson. PI. 60, figs. 66, 67. 



mf Widely umbilicated, depressed, pellucid, greenish yellow, with 



delicate revolving lines, and distant oblique longitudinal ribs ; 



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



Canada, New England to Minnesota, 

 It is H. annulata, Case. 



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



Moderately umbilicated, subdepressed, thin, with oblique, 

 rather distant, rib-like strias, the interspaces microscopically 

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

 with deep suture. Diam. 2 mill. 



Alaska to California, Cunningham Gulch, Colorado. 



