220 AMERICAN JOrRNAL 



GABBIA, nov. gen. 



Description. — Shell like Amnicola, Gould and Hald. Oper- 

 culum pancispiral, calcareous. 



Station. — Fresh water. 



3. Gabbia austealis, Tryon. — t. 22, f. 7. 



Description. — Shell small, globosely turbinated, consisting 

 of four well rounded whorls, with distinct suture; spire 

 elevated, convex, apex obtuse; lines of growth minute, 

 crowded ; aperture moderate, somewhat oblique, oval, a little 

 accuminate above and below; umbilicus scarcely covered. 



Dimensions. — Length "25 inch, diameter "185 inch; length 

 of aperture •125 inch, breadth '1 inch. 



Habitat. — New South Wales. Wesley Newcomb, M. D. 



My Cabinet. Cabinet of Dr. Newcomb. 



Observations. — A pretty shell, which does not resemble very 

 closely any of the American species. The operculum is some- 

 what calcareous like Bith. tentaculata. 



4. Pomatiopsis intermedia, Tryon. — t. 22, f. 8. 



Description. — Shell elongately turbinated, consisting of over 

 four very convex whorls; spire elevated, suture profound, 

 apex obtuse; body whorl well rounded ; aperture small, nearly 

 round; umbilicus narrow. Color dark green. 



Dimensions. — Length -18 inch, diameter •12 inch; length of 

 aperture •06 inch, breadth -053 inch. 



^a5^Yaf.— Owyhee R., S. E. Oregon. Wm. M. Gabb. 



My Cabinet. Cabinet of Mr. Gabb. 



Observations. — The above description and measurement is 

 from one of two or three adult individuals among the nume- 

 rous specimens sent by Mr. Gabb. The species differs con- 

 siderably when young. 



Its form places it intermediate between P. Nichliniana, Lea, 

 and P. lapidaria, Say. 



5. SoMATOGYRUs AUREUS, Tryon. — t. 22, f. 9. 



Description. — Shell subglobose, spire short, suture well im- 

 pressed, apex obtuse ; aperture pyriform, broadly rounded be- 

 low; columellar lip slightly reflected and appressed, scarcely 

 covering the umbilicus. Color golden yellow. 



Dimensions. — Length ^18 inch, diameter 'IQ inch; length of 

 aperture "13 inch, diameter -11. 



