68 



LAND AND FRESII-WATER SHELLS OF N. A. [PART L 



Jaw long, rather narrow, slightly arcuate ; ends but little attenu- 

 ated, almost square ; anterior surface with about nine 

 very broad, crowded ribs, each with a finely notched 

 or crenulated margin on the convex cutting edge ; 

 upper margin of the jaw concave, smooth. 



Lingual membrane (of B. notabilis) with 100? 

 rows of forty-three teeth each (21 — 1 — 21) ; centrals tricuspid ; 

 laterals and uncini bicuspid. 



Fig. 110. 



Jaw of Binneia 

 notabilis. 



Fig. 111. 



Fig. 112. 



Lingual membrane of Binneia notabilis. 



Binneia notabilis, J. G. Cooper. — Shell imperforate, depressed- 

 orbicular, subunguiform, opaque, tliin, light horn-color, striated ; spire 

 scarcely elevated ; apex obtuse ; suture deeply impressed ; one and a half 

 whirls, the first half with about thirty revolving, separated, 

 prominent, abruptly ending rib like strise, the last com- 

 prising almost the whole shell, depressed above, very rapidly 

 increasing ; aperture subhorizontal, transversely oval, very 

 large; peristome thin, acute, simple ; columella arcuate, with 

 a thin deposit of transparent callus ; apex visible from below. 

 Greater diam. 7, lesser 3^, height li mill. ; greatest transverse 

 diam. of aperture 7. 



Binneya notabilis, J. G. Cooper, Proc. Cal. Acad. Nat. Sci. Ill, 62 (1863), 

 figures.— Tkyon, Am. Journ. Conch. II, 244, pi. iii, f. 4 (1866). 



Sta. Barbara Island, California. 



For views of the animal and lingual dentition, see above. 



