Miscellaneous. 73 



moir for the Articulata, Mollusca and Radiata, which bear out the 

 same principle. 



Milne-Edwards presents reasons for separating the Batrachia from 

 the Reptiles, as first proposed by Blainville, and thus makes five great 

 divisions of the Vertebrata : — the Mammifera, Birds, Reptiles, Ba- 

 trachia, and Fishes. The Reptiles are, from the first, aerial in their 

 respiration, whilst the Batrachia, in their early state at least, have 

 branchiae like Fishes. He observes further, that the embryo of Fishes 

 and Amphibia has no allantoid nor amnios, whilst in the true Rep- 

 tiles, Birds, and Mammifera, these parts are always distinct. He 

 hence divides the Vertebrata into the Vertebras Allantoidiens and the 

 Vertebres Anallantoidiens. 



The remainder of this memoir is occupied with remarks upon the 

 Vertebrata with reference to their classification, which although of 

 high importance, we have to pass by at this time, giving only in a 

 tabular form the classification which he proposes. 



A. VERTEBRES ALLANTOIDIENS. 



I. Mammiferes. 



Monodelphiens ou Mammiferes Placentaires. 

 Mammiferes a placenta discoide. 



Bimanes, Quadrumanes, Insectivores, 



Cheiropteres, Rongeurs. 

 Mammiferes a placenta zonaire. 



Carnivores, Amphibiens, Daman. 

 Mammiferes a placenta difFus. 



Pachydermes, Solipedes, Ruminans, 



Sireniens, Cetaces, Edentes. 

 Didelphiens. 



Marsupiaux. 



Insectivores, Herbivores. 

 Monothremes. 



II. OlSEAUX. 



III. Reptiles. 

 Sauriens. 

 Ophidiens. 

 Cheloniens. 



B. VERTEfkES ANALLANTOIDIENS. 

 I. Batraciens. 



Anoures, Urodeles, Cecilies, Perennibranches, Lepidosiren. 

 II. Fishes. 



Chondropterygiens, Poissons osseux, Cyclostomes, Amphioxus. 



Notes on Diptera, Chalcidites, and other Insects. 

 By Francis Walker, F.L.S. 



I have been favoured by M. Kaltenbach of Aix-la-Chapelle with 

 the loan of the following species, and with the notes of their (Eco- 

 nomy. These notes belong to two subjects, which are — the relation 

 of parasites to their prey, and the relation of herbivorous insects to 



