84 A MANUAL Oy AMERICAN LAND SHELLS, 



cular, a little angular at base, modified by the preceding whorl; peris- 

 tome acute, simple. Greater diameter, 12"^'" ; height, 6"°^. 



Helix spor tell a, Gould, Proc. Bost. Soc. Nat. Hist., ii, 167 (184G) ; Moll. Ex. Ex., 37,* 

 tig, 42 (1852); T. M., ii, 211, pi. xxii, a, fig. 1.— W. G. Binxey, Terr. Moll , 

 iv, 19.— Pfeiffek, Mod. Hel. Viv., i, 111, v, 246 (1868).— Blaxd, Ann. N. Y. 

 Lye, vii, 366; viii, 165. 



Macrocyclis sporiella, Tryo^, km. Journ. Concb., ii, 245 (1866).— W. G. Binney, L. 

 & Fr.-W. Sh., i, 57(1869). 



From San Diego to Puget Sound in the neighborhood of the coast; 

 confined to the Pacific Province. 



See remarks under M. Vancouver ensis. 



In extreme forms of this species the revolving lines mark the whole 

 surface, even in the umbilicus and in the interstices between the incre- 

 mental striaB. 



Jaw and lingual membrane as usual in the genus, the latter resem- 

 bling that of .1/. Vancouverensis. Teeth 22-1-22. Plate XY, Fig. K., 

 of Terr. Moll., V. The central tooth is like that of last species. 



]?IacrocycIis Voyana, Newcomb. 



Shell wiaely umbilicated, depressed, planorboid, thin, translucent, 

 with delicate oblique strife of growth, and fine revolving lines, more de- 

 nr. 47. veloped below, very light horn-color; spire scarcely ele- 



vated ; whorls 5, flattened, rapidly increasing, the last 

 broad, flattened below, falling in front; umbilicus very 

 large ; aperture very oblique, removed from the axis, ir- 

 regular truncatedly ovate ; peristome thickened, subre- 

 flected, flexuose, strongly depressed above and sinuate, 

 ends approaching, connected with a stout, elevated. 



MacrocycU 

 ana 

 (Magnified twice.) 



ana. browuish, ridge like callus. Greater diameter 21, lesser 



Igmiu . height, 1" 



Helix (Macrocyclis) Foyana, Newcomb, Am. Journ. Conch., i. Part iii, 235, pi. xxv, 



fig. 4 (July, 1865). 

 Helix Voyana, Pfeiffer, Men. V. 247 (1868). 



Afacrocyclis Voyana, Tryon, Am. Journ. Couch., ii, 246 (1866). — W. G. Binney, L. & 

 Fr.-W. Sh., i, 58, fig. 98 (1868): Terr. Moll., V. 93. 



Canyon Creek, Trinity County, California, and San Diego are the only 

 localities from which it has thus far been received. It may be said, 

 therefore, to inhabit the whole of the California Eegion, near the 

 coast. 



The specimen figured was received from Dr. Newcomb. 



Jaw as in Vancouverensis. 



