ERRATA. 
Page 29, in fig. 15 omit the letter e. 
» 930, for Cut 15, read fig. 16. 
Fn Oss CUb ls sm egos 
» 140, » fig. 60, 4, fig. 62. 
» 168, ,, Limneas,,, Limnea. 
5, 536, in foot-note, for Ziphius read Peaciwn, and dele fossil. 
5 O87, in fig. 227, a dotted line should connect letter d with the dark central 
spot. 
