LINNEAN SOCIETY OP LONDON. XXI 



difficult to pick out an immense number of works deserving of 

 notice, either on account of their subject-matter and its bearings 

 upon general questions of natural history, or their mode of treat- 

 ment. In fact, with ererj desire to select only the most important 

 publications, we shall have to refer to so many memoirs, that we 

 can do little more in most cases than cite them by their titles. 



Commencing with the Crustacea, we must first notice an im- 

 portant work by Dr. Fritz Miiller of Desterro, entitled " Fiir 

 Darwin," in whieli the author discusses at considerable length the 

 evidence on the origin of species by evolution to be derived from 

 the study of the Crustacea. In the course of this discussion a 

 great number of valuable observations, especially on the develop- 

 ment of the Crustacea, are brought together ; and the whole of 

 the evidence, in the author's opinion, tends strongly to the con- 

 firmation of the hypothesis of Mr. Darwin. Several observers 

 have lately published papers on the metamorphoses of the 

 Crustacea ; and among these the first place must be given to those 

 of Dr. Miiller, in Wiegmann's Archiv, his memoirs on the meta- 

 morphoses of the Shrimps and Prawns being especially valuable. 

 M. Hesse, of Brest, has also published an interesting memoir 

 " On the Pranizce and Ancei" describing the very singular mode of 

 life followed by these creatures, whose very position in their class 

 can hardly be regarded as clearly established; and Professor 

 LiUjeborg's elaborate paper, on the curious parasitic Cirripedes 

 forming the families Sacculinidse and Peltogastridse, has been 

 republished in the Annales des Sciences Naturelles. The zoolo- 

 gical portion of the Voyage of the Novara includes descriptions 

 and figures of the new Crustacea, by Dr. Heller. 



The classes Arachnida and Myriopoda, which are generally 

 rather neglected by zoologists, have constituted the subject of 

 some valuable works. The most important of these is Mr. Black- 

 wall's History of the Spiders of Great Britain and Ireland, 

 published by the Eay Society, which, completing the revision of 

 the results of that gentleman's long-continued researches upon 

 the British Spiders, already partially published in the Trans- 

 actions of our Society and in the Annals and Magazine of 

 Natural History, and combining them with those of Mr. Temple- 

 ton's investigations upon the Irish species, furnishes a body of 

 information upon the subject such as no other country can boast. 

 Another valuable work upon the Araneida is M. Eugene Simon's 

 ' Histoire Naturelle des Araignees,' which aims at giving a com- 

 plete review of the genera of that order of Arachnida, and. 



