Shells of Common Occurrence, 



VoS 



75-76. 77-/< 



65-66. Planorbis corneus (fclie Horny Coil Shell), Linnceus^ 

 67. P. albus (the White Coil Shell), imicr. 68. P. 

 nautileus (the Nautilus Coil Shell), Linnceus. 69. P. 

 marginatus (the Margined Coil Shell), Droparnaud. 70. 

 P. carinatus (the Carinated Coil Shell), Miille)'. 71-72. 

 P. vortex (the Whorl Coil Shell), Linnceus. 73-74. P.. 

 epirorbis (the Kolled Coil Shell), Miiller. 75-76. P. con- 

 tortus (the Twisted Coil Shell), LinncBus. 77-78. F 

 nitidus (tho Fountain Coil Shell), ibid. 



