

PACIFIC COAST SPECIES. 153 



like all others, has great variation in the development of the cntting 

 points on different parts of the same membrane. 



Olyptostoina J^ewbcrryaiiMni, W. G. Binney. 

 Shell broadly umbilicated, orbicularl}- depressed, solid, lightly decus- 

 sated by incremental strife and numerous fine spiral lines; color black 

 or reddish-brown, under the epidermis white ^i^- i^^- 



and shining; suture deeply impressed; spire 



M 



depressed ; whorls 6, regularly increasing, the =■ 

 upper ones flattened, the last convex, rounded 

 below and slightly deflected at the aperture ; c. ycirU'n-nanifm. 



umbilicus broad, showing all the volutions clearly; aperture oblique, 

 transversely lunar; in young specimens the decussated sculpturing of 

 the shell on the parietal wall of the aperture is covered with a light 

 callus as the animal grows, and elegantly marked with numerous fine, 

 crowded, spiral lines; in mature specimens this beautiful marking is 

 entirely obliterated by the deposition of callus, but on breaking the 

 shell the lines will be found to exist within ; peristome simple, acute, 

 thickened within, ends slightly approximated, joined by a white callus. 

 Greater diameter 37, lesser 20'""\; height, 13'"'". 



Helix Xeu-herriiana. W. G. Binney, Proc. Aca'd. Nat. Sci, Pliilad., 1858, 115; Terv. 



Moll., iv. 20, pi. Ixxvi, fig. 7.— Pfeiffek, Mai. Bliitt., 18.^)9, 7; Mon., v, IGl 



(1868). 

 Macrocyclis Neivherryana, Tryon, Am. Joiirn. Couch., ii, '244, 5 (1866). 

 Zoniies Xeichern/niia, W. G. Binney, L. & Fr.-W. Sh., i, 282 (1869). 

 (lli/plo-ttoma Newberryanum, W. G. Binney, Terr. Moll., v, \V7A. 



Los Angeles, Cal., to Todos Santos Bay, in Lower California. A 

 coast species of the California Eegion. Very common around San Di- 

 ego, on southerly exposed hill-sides, under piles of detached rocks. 



My largest specimen has a greater diameter of 47""". 



Animal bluish slate-color. 



The jaw (see Fig. 134) is loug, low, shghtly arcuate; ends blunt; ante- 

 rior surface with about 16 stout, separated 

 ribs, scalloping either margin. The jaw is 

 lower, less arcuate, and longer than in 

 Arionfa. Its ribs resemble those of that 

 genus in projecting far beyond and scallop- 

 ing the margins of the jaw, but tliey are 

 much more numerous. This description 

 applies only to the more perfect form of the 

 jaw — noticed only in one individual. In 

 several other individuals the ribs on the q, Newberryanum. 



Flc. 13.5i. 



