576 Analytical Notices of Boohs. 



having yet been sufficiently examined to ascertain precisely its 

 location. 



The illustrations comprise figures of the Osteology of several of 

 the species described, and of numerous Crania, which are executed 

 in a very superior manner to some which have recently appeared. 



Annales des Sciences Naturelles. Nos. vi — x. 



The series of this new periodical which we have now to notice, 

 comprises some of the most important papers on abstruse points 

 of Physiology and minute Anatomy, which have of late years been 

 given to the world. Of this Class are the Researches of MM. 

 Prevost and Dumas relative to the generation of animals, which, 

 illustrated as they are with a considerable number of new facts 

 collected with the most indefatigable perseverance and arranged 

 in a manner to elucidate their various bearings, form altogether an 

 admirable production, and one which is calculated beyond any 

 other that has hitherto appeared to remove some portion of the 

 mystery in which this arcanum of nature is enveloped. This paper, 

 continuations of which are given in two of the present numbers, is 

 worthy the perusal of the philosophic Zoologist, whose attention 

 it cannot fail to arrest, and to whom it will prove a source of in- 

 creasing attraction, corresponding with the importance and diffi- 

 culty of the subject which it is designed to elucidate. Of consi- 

 derable value are also the Papers on the internal anatomy of 

 certain insects, by M. Leon Dufour, the present series of which is 

 devoted to the digestive organs of the Coleoptera, numerous spe- 

 cimens of each of the pentamerous families, and more especially 

 of the Carabidae, having been examined and figured by that acute 

 observer with the greatest care. 



The discovery in the course of the last year, by M. Mielzinsky, 

 of the larva of a Coleopterous insect which fed on snails, and from 

 which he bred an apterous female referable, as he conceived, to 

 a new genus established to receive it under the name of Cochleoc- 

 tonus,has led to some interesting results, which are detailed in the 

 publication under our notice. By this discovery, the attention of 



