148 



A MANUAL Oi' AMLlllCAN LAND SHELLS. 



sac, but uoue of the other peculiar accessory orgaus of Arionta. That 

 figured ou Plate XV, Fig. O (from Cataliua Island), has i^'oiu one side 

 of the base of the dart sac {x-)ii thread-like connection {z) with the base 

 of the penis sac, and on the other side of the base of the dart sac the 

 peculiar accessory organ y. These accessories to the dart sac are some- 

 Avhat like those found iu ^tearnsiana. 



Arionta Onbbi, Newcomb. 



Shell subperforate, depressed globose, thiii, smooth, very delicately 

 striated, dirty white, darker above, with a median revolving, white- 

 margined, brown band ; spire little elevated ; whorls 5, rather 

 convex, the last flattened-globose, descending at the aperture: 

 aperture Innately rounded, oblique; peristome white, thick- 

 ened, somewluit reflected, the columellar i^ortion almost cov- 

 ering the umbilicus. Greater diameter 10, lesser 8"""; height, 



Fir,. rJ9. 



Edix Gahhii, Newcomb, Proc. Cal. Acad. Nat. Sci., iii, 117 (18C4).— W. G. Binnev, 



L. & Fr.-W. Sh., i, 175, tigs. 304, 30.5(1869). 

 Aglaja GaWil, Tryon, Am. Journ. Concb., ii, 315, pi. vi, fig. 19 (1866); iii, pi. xi, tig. 



31 (1867). 

 Htlix facta, Newcomb, Proc. Cal Acad. Nat. Sci., iii, 118 (1864).— W. G. Binxey, 1. 



c, fig. 306. 

 Atjlaja facia, Tryox, Am. Journ. Couch., iii, 162, pi. xi, fig. 32 (1867). 

 Arionta Gahhi, W. G. Bixxey, Terr. Moll., v, 371. 



San Clemeute Island, Santa Barbara, and San Nicolas Island, Cal- 

 ifornia. A species of the California Province. 



Under the name ofiT^ tenuis Iriata (certainly not of Bin- 

 ney) I have received a shell from Catalina Island, ai)pa- 

 rently a less-develoi^ed form of A. Gabhi. It is here figured. 

 (Fig. 130.) 



Although I am convinced of the identity of facta with Gahhi, 

 I repeat below the description of the former, with a figure of 

 an authentic specimen. 

 Shell imperforate or subpertorate, globose or depressed- globose, 

 smooth, shining, surfnce hardly broken by delicate incremental stri.Tt; 

 and revolving linens, light fawn-cohT above, below lighter, with a me- 

 dian, white margined, revolving band of a darker-colored hue ; spire 

 elevated, apex obtuse; whorls 5 to 0, rather convex, the last slightly 



A. 



tenuistriata. 



