186 Bibliographical Notices, 



Infusoria, of which three only are not mentioned in my large 

 work on Infusoria, although they have since occurred living 

 near Berlin ; moreover, of the case of Daphnia Pulex ? Of the 

 twenty-nine species of Infusoria, only eight have siliceous 

 shields, the others are soft or with membranous shields. Se- 

 veral of the most beautiful exceedingly rare Baccillarice are 

 frequent in it. These Infusoria have now been preserved 152 

 years. The mass may have been raised by a storm from a 

 Courland marsh and merely carried away, but may also have 

 come from a far distant district, as my brother Carl Ehrenberg 

 has sent from Mexico forms still existing near Berlin. Seeds, 

 leaves of trees, and other things of the kind scattered through 

 the mass, were, on the examination of larger portions, easily 

 visible. The numerous native Infusoria and the shells of the 

 common Daphnia Puleos seem to speak thus much for the sub- 

 stance, that its original locality was not the atmosphere nor 

 America, but most probably either East Prussia or Courland. 

 The substance and drawings of all the constituent parts were 

 laid before the Academy. 



BIBLIOGRAPHICAL NOTICES 



The London Flora. By A. Irvine, of Marischal College, Aberdeen, 

 London, 1838. 12mo. 



It has been commonly supposed that the London district did not 

 extend to more than a few miles, twenty-five at most, from St. Paul's, 

 but the author of this book extends it to the English Channel, South- 

 ampton, Oxford, Buckingham, and parts of Lincolnshire and Der- 

 byshire. 



He proposes, but does not adopt, numerous alterations in nomen- 

 clature, many of which would doubtless be improvements, and it is 

 much to be wished that they had been made by Linnaeus. All such 

 changes are, in the present day, greatly to be deprecated as only in- 

 troducing confusion into the synonymy; similar alterations were 

 attempted by Gray in his Natural Arrangement, Salisbury, and others; 

 but there is not, we believe, a single instance of their being adopted 

 in a work of authority. The author objects to the formation of spe- 

 cific names like Smithii, Michelii, &c., and proposes that they should 

 always terminate in ana, not probably knowing that the most correct 



