422 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Succinea Stretchiana, BLAND. 



Shell globose-conic, thin, pellucid, shining, striatulate, greenish horn-colored ; 

 spire short, rather obtuse ; suture deep ; whorls 3, convex, the 

 ' last roundly inflated ; columella arcuate, slightly thickened, 



receding ; aperture oblique, roundly oval ; peristome simple, 

 with the margins joined by a thin callus. Length, 6^ mill. 



S. Stretchiana. d ; ameteri 5 mill< . a p ertur e, 5 mill. long. 



, Succinea Stretchiana, BLAND, Ann. N. Y. Lye.. VIII. 168, Fig. 16 (1865).- 

 TRYON, Amer. Journ. Conch., II. 231, PI. II. Fig. 5 (1866). W. G. BINNEY, 

 L. & Fr.-W. Sh., I. 264 (1869). 



In both Central Province and Californian Region ; Little Valley, Washoe 

 County, Nevada, on the eastern slope of the Sierra Nevada, 6,500 feet above 

 the sea ; Mariposa County, California. 



The original description and figure are given above. 



Jaw as usual ; no anterior ribs. 



The lingual membrane (PI. X. Fig. J) has 16 1 16 teeth and 8 laterals. 



Succinea Verrilli, BLAND. 



Shell ovate-conic, thin, striate, subpellucid, orange-yellow colored ; spire 

 elevated, obtuse, with globose apex, of a reddish tinge ; whorls 3, 

 very convex; suture deep; aperture oblique, roundly oval; colu- ' s ' ' 

 mella arcuate, with a slight callus ; peristome simple, the margins &A A 

 joined with a very thin callus. Length, 7 mill. ; diameter, 3| mill. ; 



t o. rCWlttlf \ 



aperture, 4 mill, long, 3 wide. 



Succinea Verrilli, BLAND, Ann. N. Y. Lye., VIII. 169, Fig. 17 (1865). TRYON, 

 Am. Journ. Conch., II. 234 (1866). W. G. BINNEY, L. & Fr.-W. Sh., I. 254 

 (1869). 



Salt Lake, Anticosti Island, Gulf of St. Lawrence, is the only locality thus 

 far known ; it must thus be counted among the species of the Northern Region. 



Animal (in alcohol) black. 



The original description and figure are given above. 



Jaw abruptly arched, with one prominent central projection. 



Lingual membrane with about 80 rows (31 1 31); base of attachment 

 notched at its outer posterior edge, longer than wide ; central tooth with three 

 minute denticles, the middle one being largest ; lateral teeth bidentate, the 

 outer denticle minute ; marginal teeth irregularly dentate or notched. (Morse.) 



Succinea aurea, LEA. 

 Vol. III. PI. LXVII. c, Fig. 2. 



Shell very symmetrical in form, elongated-oval, the texture very thin and 

 lucid, and of a clear amber-color ; whorls 3, the suture deeply impressed, and 



