SMITHSONIAN MISCELLANF.OUS COLLECTIONS 



VOL. Q2 



the shell as a whole more solidly built, the spire more bluntly conical, 

 and the whorls less broadly rounded, those in the new species being a 

 little flattened, and turning sharply into the suture. J\ antiquilina 

 differs from V. antlqua Morris (pi. i. fig. 5) in the proporticjns of the 

 shell (see measurements below), the new form being slightly more 

 broadly built, in having the suture a little deeper, and in the whorls 

 being regularly rounded and slightly tiattened, ratlier than rounded and 

 projecting downward as in / '. antlqua. 



No living specimens were found, all the shells being empty and 

 bleached. Apparently this species lived in Lake Khomotenoye at some 

 former time when the water level stood considerably higher than at 

 present. 



Measurements of flic SItells oj J'alvata antiquilina, n. .9/)., }roni the Shore nj 

 Lake KJiomolenoyc, Siberia 



Measurements of the Shells of Valvata antiqua Morris from Grays, Essex 



(Type Locality) 



LYMNAEA (GALEA) PALUSTRIS SARIDALENSIS, n. subsp. 



Plate I, fig. I 



Shell of moderate size, length 23.9 mm, elongate, and much nar- 

 rower in proportion to the length than in the usual forms of pa! us tr is; 

 light horn-colored, thin, surface smooth, minutely wrinkled, lines of 

 growth not prominent, crossed by impressed spiral lines ; whorls 



