PALUDINA MAGNIFICA. 35 



terior angle of the aperture; suture deeply 

 impressed ; apical margin of the whirls bor- 

 dered with a prominent subnodulous undu- 

 lating line ; aperture wide, very oblique, and 

 rounded anteriorly; labrum sharp, subangular, 

 with a level margin ; opercle very thin, 

 translucent, rectilinear upon the inner, and 

 semicircular upon the outer side ; the margin 

 highly colored ; the lines of growth, although 

 indistinct, appear to be concentric. 



COLOR of the shell varying from yellowish 

 green to dark olivaceous ; a dark line fre- 

 quently covers the central row of tubercles ; 

 the inside is generally light salmon color, 

 banded with purple. 



OBSERVATIONS. 



The rows of tubercles are sometimes obso- 

 lete, and replaced by subnodulous lines. Some 

 specimens are rather ventricose, and others 

 more slender than those figured. 



The young shell has only the central row of 

 tubercles, and has the apex obtusely rounded. 



