124 A MANUAL OP AMERICAN LAND SHELLS. 



Ag:laia Hillebraiidi, Nkwcomb. 



Shell umbilicated, biconvex, orbicularly depressed, carinated, yel- 

 Fic. 95 lowisli liorn color, with a chestnut band within two 



white ones, showing only in the aperture, granulated, 

 finely striate and hirsute ; spire subpyramidal ; whorls 

 G, slightly convex, the last carinated at its middle, in- 

 flated below, slightly descending; aperture oblique, 

 lunate, subangnlate, white and banded within ; peris- 

 tome white, thickened, reflected, partially concealing 

 the open umbilicus, ends approached. Greater dlam- 



A^^Z^ranai. ©tcr 25, lesser 19-"; height, 10-™. 



Helix Eilleirandi, Nkwcomb, Proc. Cal. Acad. Nat. Sci., iii, 115, 181 (1864).— W. G. 



BiNNKY, L. & Fr.-W. Sh., i, 163, fig. 281 (1869). 

 Jglaja HiUehmndi, Tryon, Am. Journ. Couch., ii, 310, pL v, fig. 7 (1866).— W. G. 



BiNXiCY, Terr. Moll., v, 152, 



Calaveras County, Tuolumne County, California Eegiou; also near 

 Mariposa. A species of the Sierra Nevada and not of the coast coim- 

 ties. 



The specimen figured is from Dr. Newcomb. 



Animal unobserved. The species is rarely met with in collections. 

 I regret extremely not being able to describe its genitalia, which would 

 show more clearly its relations to Aglaia and Arionta. 



ARIOI¥TA, Leach. 



Animal heliciform, mantle subcentral; other characters as in Patula, 

 Provided with a thick, white epiphragm. 



Shell umbilicately perforate, conic- or depressed -globose, thin ; whorls 

 5-6, the last gradually descending ; aperture lunate-rotund ; peristome 

 broadly labiate, its margins parallel, the basal dilated, often covering 

 the umbilicus. 



The genus is almost exclusively confined to the California Eegion of 

 our limits, with the restricted range of the species shown on p. 126. 

 There is, however, one Mexican species, one African, and one European, 

 A. arhusforum. The jaw of the last agrees with that of our species. 



Jaw thick, high, arched, ends but little attenuated, blunt; cutting 

 margin without median projection; anterior surface with a few, sep- 

 rio.j)6. arated, stout ribs, deeply denticulating either margin, 



and so disposed as to leave each end of the jaw free 

 ^. from ribs. I have counted 6 ribs on the jaw of 



Ifav! o( A. arrusa. arrosa ; 9 in Townsendiana ; 6 in tudiculata; 4 in 



