ERRATA IN PART I. 



It is particularly requested that tlie following corrections be made with the pen at page v of 

 the Introduction : — Foot note, four lines from the bottom of the page, after Bh, instead of " mesogastric," 

 read " mesobranchial ; " after B c, fvr " metagastrie," read " nietahrauchial ;" after C a, for " epigastric," 

 reffrf "epicardiac ; " after C h, /or " metagastrie," reorf " metacardiac." 



Page vii, line G,for " Cyclocoryster," read " Cyclocorystes." 



Page 38, line 3, the quo'.atiou from Davila should he transferred to the synonyms. 



Explanation of Plate YI, add -" 11. IMale abdomen of the same." 



