374 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Glyptostoma Newberryaiium, W. G. BINNEY. 



Shell broadly umbilicated, orbicularly depressed, solid, lightly decussated by 

 incremental striag, and numerous fine spiral lines; color black or reddish-brown, 



under the epidermis white and shining ; suture 

 Fig. 258. 



deeply impressed; spire depressed; whorls 6, 



regularly increasing, the upper ones flattened, 

 the last convex, rounded below, and slightly 

 deflected at the aperture ; umbilicus broad, show- 

 ing; all the volutions clearly ; aperture oblique, 

 G. Newlenyanum. a 



transversely lunar ; in young specimens the de- 

 cussated 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 diam- 

 eter 37, lesser 20 mill.; height, 13 mill. 



Helix Newberryana, W. G. BINNEY, Proc. Acad. Nat. Sci. Philad., 1858, 115 ; 



Terr. Moll., IV. 20, PI. LXXVI. Fig. 7. PFEIFFER, Mai. Blatt., 1859, 7; 



Mon., V. 161 (1868). 



Macrocyclis Newberryana, TRYON, Am. Journ. Conch., II. 244, 5 (1866). 

 Zonites Newberryana, "W. G. BINNEY, L. & Fr.-W. Sh., I. 282 (1869). 



Los Angeles, California, to Todos Santos Bay, in Lower California ; a spe- 

 cies of the California Region. Very common around San Diego, on southerly 

 exposed hillsides, under piles of detached rocks. 



My largest specimen has a greater diameter of 47 mill. 



Animal bluish slate-color. 



The jaw (see Fig. 257) is long, low, slightly arcuate; ends blunt; anterior 

 surface with about 16 stout, separated ribs, scalloping either margin. The jaw 

 is lower, less arcuate, and longer than in Arionta. Its ribs resemble those of 

 that genus in projecting far beyond and scalloping the margins of the jaw, 

 but they are much more numerous. 



This description applies only to the more perfect form of the jaw (Fig. 257), 

 noticed only in one individual. In several other individuals the ribs on the 

 jaw were much more narrow and less projecting at the upper and lower mar- 

 gins. There is more difference between these than is usually found in differ- 

 ent individuals of the same species. 



Lingual membrane (see last page). 



Genitalia figured on PI. XIV. Fig D. The epididymis is very long, convo- 

 luted in the lower half of its length, straight above. It runs free for a long 

 distance outside the membrane which covers the oviduct, before entering into 

 the liver, where it joins the testicle. The latter is imbedded in the liver, near 



