140 



A MANUAL OF AMERICAN LAND SHELLS. 



HeJix tiidiciihtt((, I51NNKY, Bost. Jourii. Nat. Hist., iv, 1360, pi. xx (1843); Terr. 

 Moll., ii, 118, pi. xvi.— Pkkiffek, Mon. Hel. Viv., 1,283; iv, 270.— W. G- 

 BIXXEY, Terr. Moll., iv, 7; L. cV: Fr.-W. Sb., i, 1G5 (18G9). 



AgJaja iudicuJata, Tkyox, Auier. Joiirii. Couch., ii, 313 (1867). 



Arionia tudiculata, W. G. Binney, Terr. I\loll., v, 357. 



A species of the California Province, found in the neigLborliood of the 

 coast from Sau Diego to San Buenav( ntura, and from the same i)oint 

 found also ranging into the Sierra Xevadii, through Tulare, Fresno, 

 Merced, Tuolumne, Calaveras, I^sevada Counties. Thus it is the only 

 A.rionta inhabiting both the coast and Sierra Nevada. 



A variety of this species received, under the name of ".ff. cypreo- 

 FiG. 119. 2)hila, Newc, Copperopolis, Cal.," irom Dr. Js\nvcomb, 



is here figured. It is characterized by a thin shell 

 and partially oi)en nmbilicus. I have also received 

 it from San Diego. 



Jaw thick, long, narrow, slightly arched; ends but 

 A. cypreophiia. slightly attenuated, blunt ; anterior and posterior 

 surface equally showing G stout, broad ribs, denticulating either mar- 

 gin. 



The lingual membrane (Terr. Moll., Y, Plate IX, Fig. E) has 50-1-50 

 teeth, with 20 perfect laterals, all of the type usual in the genus. The 

 dentition and genitalia of cyprcoiMla is similar to those of the typical 

 form. 



Genitalia as in A. XicMiniana. 



Fig. 120. 



Ai'ioiita IVIoriiioiiiiiii, Pfkiffek. 



Shell umbilicated, depressed, rather thin, with arching striiie, lightred; 

 spire scarcely elevated-conic ; whorls G, slightly 

 convex, gradually increasing, the last convex above 

 and below, rather swollen before, scarcely falling, 

 ornamented above the middle with a chestnut 

 band doubly edged with white, convex below; um- 

 bilicus moderate, conical ; aperture very oblique, 

 ear-shaped, lunate; peristome with a white thick- 

 ening, its ends converging, the right very mucli 

 arched, expanded, the columellar curved and slop- 

 Greater diameter !29, lesser 24i""" ; 



A. Monniimon. 



ing, reflected, expanded above 

 height, 12^'"™. 



