282 LAND AND FRESH-WATER SHELLS OF N, A. [PART I. 



and lateral teeth are arranged in straight, transverse rows, the 

 uneini in somewhat diagonal rows, thus dividing the lingual 

 membrane into three distinct transverse sections. 



The species of this genus are allied to the Hyalinse by the 

 character of the shell, jaw, and lingual dentition, but differ from 

 them in the presence of the caudal mucus pore. 



SuBGESus ^GOFIS, Fitz. 

 Shell widely umbilicated, orbicularly convex or depressed, 

 striated or decussated, smooth below, shining; whirls 6-T, gradu- 

 ally increasing ; aperture oblique, lunar ; peristome straight, 

 acute, lightly labiate within. 



Zoiiites nevrlJerryana, W. G. Binn. — Shell broadly umbili- 

 cated, orbicularly depressed, solid, lightly decussated by incremental 

 striae, and numerous fine spiral lines ; color black or reddish-brown, under 

 the epidermis white and shining ; suture deeply impressed ; spire de- 

 pressed ; whirls six, regularly increasing, the upper ones flattened, the 

 last convex, rounded below, and slightly deflected at the aperture ; um- 

 bilicus broad, showing all the volutions clearly ; aperture oblique, trans- 

 versely-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 speci- 

 mens 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. 37, lesser 20 ; height 13 mill. 



Helix newbernjana, W. G. Binney, Proc. Acad. Nat. S(!i. Pliila. 1858, 115 ; 



Terr. Moll. IV, 20, pi. Ixxvi, f. 7.— Pfeiffer, Mai. Blatt. 1859, 7. 

 Macrocycli.1 newherryana, Tryon, Am. Journ. Conch. II, 244, pi. iii, f. 5 



(186G). 



San Diego, California, and lately catalogued by Dr. Newcomb 

 from the Temescal Mountains, near Los Angelos. 



Fi2. 504. 



Zonites newbe.rryanii. 



