394 The Molluscan Family Planorbidae 



PLATE 79 



Shells of Planorbidae 



1-3. Segmentina nitida (Miiller). Swamp on a meadow in Czerniakow, a suburb of 



Warsaw, Poland. Baker coll., 3972. X4. 

 4-Q. Hip pe litis fontanus {Ijightioot)=^ cornplanat us (Linn.). Damsells Mill Pond, 



Painswich, West Strand, England. Baker coll., 1256. X6. 

 7-9. Polypylis largiUiarti (Phil.) ^ hemisphaerula (Benson). Peiping, China. Baker 



coll., 5973. X4. 

 10-12. Platytaphius heteropleurus (Pils. & Van.). Lake Titicaca, Peru. Baker coll., 



3974. X2. 

 13-15. Mcnetus dilatatus (Gould). Wrights Dike, Duxbury, Massachusetts. Baker 



coll., 3978. X4. 

 16-18. Drepanolrcma anatinum (Orb.). Figures 16, 17, Para, Brazil. U.S.N.M., 348535; 



fig. 18, Para, Brazil M.C.Z., 72832. X5. 

 19-21. Promenetus exacuous (Say). Small brook west bank Caj^uga Lake, near 



Cayuga, New York. Baker coll., 1140. X4. 

 22-24. Mcnetus opercidaris (Gould). San Francisco, California. U.S.N.M., 227303. X4. 

 25-27. Planorbida armigera (Say). Thief River Falls, Minnesota. U.I., 27093. X4. 

 28-30. Planorbida ivheatlcyi (Lea). Boligee, Alabama. Baker coll., 1140. X4. 

 31,32. PerriniUa corddlcriann (Hannibal). Truckee Lake Beds, Nevada. Hill near Haw- 

 thorne, on Belmont Stage Road, Nevada. Hannibal, Proc. Mai. Soc, X, plate 



6, fig. 16, plate 8, fig. 34. About natural size. 

 33-35. Indoplanorbis exustus (Desh.). Figures 33, 34, Bombay, India. Baker coll., 



1231; fig. 35, Calcutta, Lidia, Baker coll., 2229. Xl%. 



