ARIONTA. 



361 



Helix crebristriata, Newcomb, Proc. Cal. Acad. Nat. Sci., III. 116. 

 Polymita intercisa, Tryon, Am. Journ. Conch., II. 319 (1867). 

 Arionta crebristriata, Tryon, 1. c, II. 317 (1867). 



This species of the California Region, until quite recently known only by 

 the single specimen in Dr. Binney's collection, supposed 

 to be from Oregon, has recently been described from San F 'K- 24L 



Clemente Island, and Santa Cruz Island, California, under 

 the name of //. crebristriata, by Newcomb, one of whose 

 specimens is here figured. An apparently semi-fossil form 

 occurs, with thick shell, heavy, rough growth beyond the 

 peristome, which is made continuous by its ends being 

 joined by a very solid, raised callus. 



Animal unobserved. 



Arionta Kelletti, Forbes. 



A- crebristriata. 



Fig. 242. 



A. Kelletti. 



Shell narrowly umbilicated, depressed-globose, thin, wrinkled, granulated, 

 fulvous ; spire subturbinated, with dirty reddish 

 blotches and one red revolving band; whorls 6, 

 rather convex, the last with a white band at its pe- 

 riphery, and inflated on its under surface; aperture 

 roundly lunate, light red and banded within ; peri- 

 stome somewhat reflected, its columellar portion di- 

 lated, reflected, covering the umbilicus. Greater diam- 

 eter 22, lesser 19 mill. ; height, 19 mill. (Forbes.) 



Helix Kelletti, Forbes, Proc. Zool. Soc. London, 1850, 55, PI. IX. Fig. 2, a, b. 



— Reeve, Con. Icon., No. 665 (1852). — Pfeiffer, Man. Hel. Viv., III. 183 ; 



in Chemnitz, ed. 2, II. 467, PI. CLVI. Figs. 19, 20 (1853). — W. G. Binney, 



Terr. Moll., IV. 17, PL LXXXVI. Fig. 12 ; L. k Fr.-W. Sh., I. 176, Fig. 309 



(1869). 

 Arionta Kelletti, Tryon, Am. Journ. Conch., II. 317 (1866). 



San Diego; Catalina Island, San Nicolas Island? California; in the Cali- 

 fornia Region. 



Animal bluish slate-color. 



The specimen figured is from Catalina Island, California. I am positive that 

 it is correctly referred to Kelletti. The umbilicus is entirely closed in mature 

 specimens. There are traces on different parts of each shell of three different 

 series of sculpturing ; the wrinkles of growth, revolving impressed lines, and a 

 series of minute granulations running obliquely, sometimes almost perpendicu- 

 larly, to the incremental wrinkles. 



Forbes's original figure of H. Kelletti is copied in Volume IV. 



For comparison with A. Stearnsiana, see that species. 



Jaw as usual ; 6 ribs. 



The lingual membrane (PL IX. Fig. I) has 57 — 1 — 57 teeth; the sixteenth 



