360 TERKESTRIAL AIR-BREATHING MOLLUSKS. 



rather blunt ; spire elevated ; suture impressed ; -whorls 6, convex, the last 

 quite large and rounded, falling towards the aperture, and banded with reddish- 

 brown above the middle ; aperture rather large in proportion to the size of the 

 shell, very oblique, transversely rounded, within showing the band ; peristome 

 simple, reddish ash-color, thickened, reflected slightly at the base, ends ap- 

 proached ; umbilicus entirely covered with a white callus. Greater diameter 

 81, lesser 17 mill. ; height, 12 mill. 



Helix redimita, W. G. BINNEY, Proc. Acad. Nat. Sci. Philad., 1857, 183 ; Terr. 



Moll., IV. 10 ; L. & Fr.-W. Sh., I. 167 (1869). PFEIFFER, Mon. Hel. Viv., 



IV. 349. 

 Helix Nickliniana, var., BINNEY, Terr. Moll., III. PI. VI. Fig. 1 (except middle 



figure). 

 Polymita redcmita, TRYON, Am. Jonrn. Conch., II. 320 (1867). 



San Clemente Island, California, in the California Region. 



This will probably prove a less developed form of the protean ramentosa. I 

 retain it therefore with great doubt as a distinct species. 



Jaw stout, strongly arched, transversely striate in parts ; ends blunt, scarcely 

 attenuated ; with 6 prominent, sharp ribs, equally visible on both anterior and 

 posterior surface, their ends strongly pectinating both margins. 



The lingual membrane (PI. IX. Fig. G) has 43143 teeth. The seven- 

 teenth tooth has its inner cutting point split I can detect no side cusps to 

 outer laterals. 



Genitalia unobserved. 



Arionta intercisa, W. G. BINN. 

 Vol. III. PI. VI. Fig. 1, middle fig. 



Shell globose-conic, with 5 slightly rounded whorls ; spire little elevated ; 

 suture distinct ; upon the body-whorl a dark revolving band, hardly discern- 

 ible ; aperture very oblique, shape of a horseshoe ; peristome thickened, 

 heavy, dirty white, slightly reflected at the umbilicus, which it entirely con- 

 ceals, near its junction with the columella furnished with a tooth-like process, 

 the extremities connected by a heavy ash-colored callus, which is spread more 

 lightly over the whole parietal wall ; epidermis grayish-yellow, apex rufous ; 

 the striae of growth are very numerous and distinct, crossed by numerous, 

 regular, revolving lines, so deeply impressed as to entirely separate them into 

 small sections; thus the whole surface of the shell is divided into minute, raised 

 parallelograms, separated by the deep longitudinal and horizontal furrows. 

 Greatest diameter 22, lesser 19 mill.; height, 15 mill'. 



Helix intercisa, W. G. BINNEY, Proc. Acad. Nat. Sei. Philad., 1857, 18 ; Proc. 

 Bost. Soc. Nat. Hist., VI. 156 (1857) ; Terr. Moll., IV. 8 ; L. & Fr.-W. Sh., 

 I. 167 (1869). PFEIFFER, Mon. Hel. Viv., IV. 349. 



Helix Nickliniana, var., BINNEY, Terr. Moll., II. 120 ; III. PI. VI. Fig. 1 (mid- 

 dle h'gure). 



