164 



new species of Leineonema, parasitic on Mustela vulgaris, was communicated to the 

 Academy of Sciences at Brussels, on the 5th of April, 1851. 



Cirrhipeda. 



The development of five different species of Cirrhipedes, belonging to the genera 

 Balanus, Chthalamus and Clitia, from the first bursting of the egg, has been observed 

 and illustrated by Mr. C. S. Bate, (Ann. Nat. Hist. viii. 324). 



Fossil Crustacea. 



The fossil Crustacea of Sweden have been described and figured by H. P. Angeliu 

 in his ' Palaeontologia Suecica (4to. Lund), fasc. 1. Iconographia Crustaceorum for- 

 mationis transitionis, (24 plates). 



Tiulobites. 



Dr. Taylor, in a communication to Silliman's Journal, has opposed the assertion of 

 Barrande of Prague, that Trilobites vary greatly according to age (and consequently 

 that many of the recently formed genera must be sunk, being established on indivi- 

 duals of the same species of different ages), having observed Calymene senaria and 

 C. Blumenbachii of all sizes without any variation in their appearance. He has also 

 described a specimen of Isotelus megistos, which, if complete, would measure 18| inch- 

 es by 9| inches in size. 



Arachnida. 



M. E. Blanchard has published (Ann. Sci. Nat. 3rd ser. xii. 316) an extended me- 

 moir on the circulatory and respiratory organs of the following Arachnida : — Epeira 

 diadema, Arauea domestica, Sagestria perfida, the scorpion, and Phalangium opilo. 

 As the classification of this class is so much dependent on these organs, the memoir 

 acquires additional value. A supplementary note (Ibid. p. 351) describes the blood of 

 the Arachnida and its corpuscles. 



Spiders. 



The 6th volume of the Boston 'Journal of Natural History ' completes Dr. Hentz's 

 memoir on the Araneides of the United States ; all the species of which are figured, 

 generally of the size of life. 



Mr. Blackwell has communicated a very valuable synonymical list of 106 British 

 species of spiders, accompanied by remarks on their habits, to the Ann. Nat. Hist. vii. 

 and viii. 



Captain Sherwill has published a note on the habits of a bird-devouring spider on 

 the Kerrakpur Hills on the Ganges, the webs, of a bright yellow colour, being spun 

 across paths, and in one of them a bird was found entangled, upon which the young 

 spiders, eight in number, were feeding, (Ann. Nat. Hist. vii. 427). 



A memoir on the genus Salticus, and on a new species found near Paris, closely 

 resembling an ant, has been published by M. Lucas in the ' Kevue Zoologique,' 1850, 

 p. 492. 



M. Lucas has noticed the occurrence of the genus Filistata, hitherto regarded as 

 peculiar to the Old World, in the New, having received a species apparently identical 

 with F. bicolor, Walck., from St. Domingo, (Ann. Soc. Ent. Fr. ix. p. xxviii.) 



