48 BOOK OF SPECIES. 



whorls six, tumid, olive^ with three reddish-brown 

 bands; sutures well defined. 1^. B. T. 119. 



P. IMPURA. Oval -oblong, j^ellowish horn- 

 colour, smooth, pellucid ; whorls five ; no um- 

 bilicus, i. B. T. 120. 



P. viRiDis. Somewhat conic and obtuse, 

 pellucid, inflated^ smooth, with four tumid volu- 

 tions, and no umbilicus ; light greenish. ^. B. 

 T. 122. 



AMPULLARIA. FLUVIATILE. 



Globular, ventricose ; base umMlicated; left Up 

 without a callosity ; aperture oblong, e7itire ; 

 margins united; outer lip acute, but not re- 

 flected; an operculum. 



A. EFFUSA. Orbicular-ventricose, widely um- 

 bilicate, smooth, white, with yellow and brown 

 bands; spire exceedingly short; mouth orange; 

 margins effuse; diam. 2J. W. 33. 73. 



A. AVELLANA. Sub-orbicular, flattened above, 

 perforated, thickish, longitudinally wrinkled, yel- 

 lowish brown ; the last whorl angular above, sub- 

 carinated ; spire acute, extremely short ; diam. f . 

 W. 33. 46. 



A. FASciATA. Ventricose, smooth, whitish, 

 with bluish bands ; spire short, and obtuse; movith 

 reddish; diam. 1|. W. 20. 71- 



