ERRATA. 



Page 29, in fig. 15 omit the letter e. 

 30, for Cut 15, reader. 16. 

 46, Cut 12, fig. 15. 

 140, fig. 60, fig. 62. 

 168, LimnceaS) Limncea. 



536, in foot-note, for Ziphius read 0aXa/i/>j, and dele fossil. 

 537, in fig. 227, a dotted line should connect letter d with the dark central 

 spot. 



