154 Beautiful Shells. 
of Great Britain and Ireland. The mud is prolific 
of shells; witness the Planorbis family, of which 

82. 84-85. 86. 
79, Limneeus auricularius (the Wide-eared Mud Shell), 
Iinneus. 80. L. pereger (the Travelled Mud Shell), 
Miller. 81. L. stagnalis (the Lake Mud Shell), Zinneus. 
82. L. fossarius (the Ditch Mud Shell), Turton. 83. L. 
glaber (the Hight-Whorled Mud Shell), cbid. 84-85. L. 
palustris (the Marsh Mud Shell), Linneus. 86. L. gluti- 
nosus (the Glutinous Mud Shell), Miller. 
nine species are here figured. They have been 
likened to the fossil Ammonites, for which they might 
be taken as miniature copies. The name is hence 
a kind of contradiction in terms, compounded of 
the words which signify “ flat’? and “ball.” The 
largest is the P. corneus (Figs. 65 and 66), an inch 
in diameter; the others are P. albus, from one- 
