114 



LAND AND FRESH-AVATER SHELLS OF N. A. [PART III. 



apes acute, distinct, not truncated ; whirls regularly increasing, inflated, 

 the last globose, equalling about two-thirds of the shell's length; aperture 

 oblique, rounded, large ; lip continuous in one plane ; 

 Fiff. 225. peristome thin, acute, continuous ; columellar ex- 



tremity appressed to the body whirl, almost entirely 

 concealing a minute umbilicus ; parietal wall of the 

 aperture covered with a thin, shining, colorless callus. 

 Length of axis 19 mill., breadth 17 mill. 

 Near Chopatilo, Mexico. 



Vivipara inornata, W. G. Bixsey, Am. Joum. Conch. 

 I, 49, 1865, pi. vii, f. 1. 



It is after a very careful examination of the 

 specimens brought from Chopatilo, that I have 

 decided to propose for them a specific name. Having- submitted 

 them to several experienced Conchologists, I find my decision 

 approved by them. It can be compared with no known American 

 form. 



The smooth, polished surface, unbroken by revolving lines, the 

 pale olive color and acute apex, are the more prominent features 

 of it. 



About a dozen specimens were brought. On one is an obtuse, 

 ill-defined carina on the middle of the bodv whirl. 



Vivipara inornata. 



Fig. 226. 



MELAXTHO. (Page 35.) 



Bowditch thus describes and figures Melantho 

 as a subgenus of Melania (Elem. Conch. 1822, p. 

 27, pi. iv, f. 15) :— 



Peristome incomplete, not effusive ; very thick; white. 

 Subglobular. Marine. 



Melantho decamp i, Cukkier. — Shell ovate, 



oblong, imperforate, rather thick, irregularly roughened 



by occasional coarse wrinkles of growth, decussated by 



delicate revolving and longitudinal strije ; greenish olive, 



with revolving dark broad lines when young, darker when old ; suture 



impressed, spire elevated, but truncated ; remaining whirls three, of which 



the two upper are liatteued, the lower sub-convex, with a median obtuse 



