250 Analytical Notices of Books. 



they have yet been ascertained, are particularly noticed. The figures are 

 numerous, and furnish representations of all the species of Zoea hitherto 

 described ; of two new ones discovered by Mr. Thompson in the Atlantic 

 Ocean ; of that which forms the subject of his observations, including so 

 much as could be seen of the change which it underwent ; and of the 

 supposed metamorphosed animal of Slabber. The various parts of the 

 Cove species are given with much detail, as is also the progressive growth 

 of Mysis vulgaris, of which, and of the Mysis ChamcBleon, the dissections 

 are very extensive and minute. Both the latter are regarded as new, 

 although they approach very nearly to two species described by Dr. 

 Leach. 



The authour need not be reminded that his principal discovery is one of 

 high interest, and that as such it requires strong confirmation from 

 repeated researches and experiments extended throughout the whole of 

 the Decapodous Crustacea within his reach. His exertions cannot be 

 better directed than to the collection of facts, for the accumulation of 

 which he possesses such favourable opportunities. 



Nova Acta Physico^Medica Academice CcBsarecB Leopol- 

 dinO'CarolincB Naturce Curiosorum, Tomus XIII. — 

 Bonnae 1826—7. 



The two parts of the transactions of this learned Academy which we 

 have now to bring under the notice of our readers, are fully equal in zoo- 

 logical interest to that which preceded them, an analysis of which will 

 be found at p. 249 of our last volume. We shall proceed at once and 

 without preface to give such an account of the memoirs which compose 

 them as our restricted limits will permit, arranging them as usual in 

 systematic order. 



The highly important anatomical essay, " De animalium quorundam, 

 " per hyemem dormientium, vasis cephalicis et aure intern^," is dedi- 

 cated by its intelligent and industrious authour. Dr. A. G. Otto, to the 

 illustrious Blumenbach, on the occasion of his being presented vdth the 

 diploma of the Academy, in honour of the completion of the fiftieth year 



