LINNEAN SOCIETY OF LOXDOX. IxVU 



Ccfleopteronim Helvetica.' H, Frey's catalogues of and notes on 

 Swiss Microlepidoptera, in the ' Mittheilungeu ' of the Swiss 

 Entomological Society. P. E. Miiller, Note on the Cladocera of 

 the great lakes of Switzerland, from the ' Archives ' of the Biblio- 

 theque Universelle, xxxvii. April 1S70. " In his excellent memoir 

 on the Monoclea of the neighbourhood of Geneva, Jurine had only 

 described the small Crustacea of ponds and swamps. He had not 

 investigated the species which inhabit the Lake of Geneva, and he 

 had also neglected some very interesting forms wMch are only to be 

 met with in large expanses of water, such as BijUiotreplies longi- 

 manus and Leptodora hyalina. M. Mueller points out the differences 

 there are between the Cladocera of the centre of the lakes and those 

 of the margins. The former, which float freely over the lake, have 

 a peculiar stamp, marking also the marine Crustacea of open seas ; 

 their bodies have an extreme transparency, and they show a great 

 tendency to the development of long and rigid balancing organs. 

 The latter, on the contrary, are little transparent, have stunted 

 forms, and are without balancing or other elongations, which might 

 interfere with their movements amidst sohd objects, such as stones 

 and aquatic plants near the shores ; most of these littoral species 

 show, moreover, a development of some organ that assists them in 

 moving upon solid bodies. M. Miiller finds also a very great 

 connexion between the Cladocera! faunas of Switzerland and 

 Scandinavia." 



The Association zoologique du Leman, founded upon the model 

 of the Ray Society, has for its object the publication of monographs 

 relating to the basin of the Leman or Lake of Geneva — that is, the 

 region comprised between Martigny and the Perte du Rhone, with 

 the valleys of the affluents received by the Rhone in this portion of 

 its course. It has been carried on as successfully as could have been 

 expected from a scientific undertaking of this nature, reckoning at 

 the present moment nearly 200 members. It has already published 

 papers by A. Brot on the shells of the family of Naiada3, with nine 

 plates ; by F. Chevrier on the Nyssae (Hymenoptera) ; by Y. Fatio 

 on the Arvicola, with six plates ; by H. Foumier on the Dascillidge 

 (Coleoptera), with four plates ; and is now issuing a more important 

 work, the resvdt of long and patient investigation, G. Lunel's 

 * Histoire NatureUe des Poissons du Bassin du Leman,' in folio, with 

 twenty plates beautifully executed in chromolithography. Two 

 parts, with eight plates, have already appeared ; and the work is in 

 rapid progress. A specimen of the plates, received from M. Hum- 

 bert, lies on the table of our library. I have also a rather long list 



