ADDENDA ET CORRIGENDA. 523 



PART 11. 



p. 194. — Perhaps no animals are more worthy of the Physiolo- 

 gist's attention than Heteromerous Insects. Their singular proper- 

 ties have afforded objections to the second character of distinction 

 between the Vegetable and Animal kingdoms, which may seem op- 

 posed to an expression in p. 192. But we ought not at present to 

 lay any great stress on such objections, since Mr. Baker's curious 

 experiments on the Blaps Morfisaga, which he has detailed in the 

 Philosophical Transactions, and which appear to have been only 

 repeated by M.Biot, prove no more than that this annulose animal 

 can exist in air extremely rarified. M. de Humboldt has also shown 

 in tl^ie Mimoires de la Societi d'Arcueil, that the air-bladder of fresh- 

 water fishes contains from four to seven per cent, of oxygen. Hence, 

 all that can be said of those intestinal worms which have been cited 

 as the most striking examples of the power of an animal to live 

 without oxygen, is, that the minutest particle of this air is sufficient 

 for their existence. 



P. 230, 1. 15, for Thethya read Tethya. 



P. 258, 1. 12. I have here adopted the French word Batracien, 

 which would have been more correctly Batrachien. 



P. 261, last line but one, toxjmiily read class. 



P. 278, 1. 8. When this was written X had only seen M. Latreille's 

 report, since which M. Savigny's work has itself appeared. From 

 this it seems, that now, in order to occasion as little violence as 

 possible to nomenclature, he has altered his first intention, and given 

 the name of Sangidsuga to the common leech, assigning the gene- 

 ric appellation of Hamopis to the horse-leech. 



P. 288, 1. 4, for leads read lead. 



P. 351, 1. 5, for the read iome. 



P. 367, 1. 8, before Cuvier insert Fubricius. 

 , 1. 18, for apoda read apus. 



P. 375. 1. 7, after antenna' erase the words the presence of ocelli, 



1.11, after be erase the words destitute oj" ocelli. 



P. 436, 1. 5. — Panzer in the Fauna Germanica, fascic. 68. n. 24, 

 has given a figure of an insect found in ant-nests, and which he 

 terms Blatta acervorum. Respecting its affinities he merely observes, 

 " Ambiguum insectum ! an hujus generis ^^ quamvis maxime Blattis qf- 

 fine, an jam declaratum ? " Never having seen the insect myself, 

 I could not venture to express any decisive opinion on its natural 

 situation at the time my sentiments with respect to the connexion 

 existing between the Blattina and Gryllina were written. Since 

 then, however, I have had the satisfaction of seeing in the 16th vol. 

 of the Biblioteca Italiunri, a very interesting paper entitled " Osser- 



