1894 THE MICKOSCOPE. 151 



outer test has been detected. Most of the forms figured 

 have holes or perferationsin the outer test, thus showing 

 a lattice-like structure. 



M. Cayeux has figured 45 different forms assigned to 

 19 genera of Radiolaria. The figures are drawn by an 

 artist totally unacquainted with those organisms and 

 therefore unbiassed. They present strong prima facie 

 resemblance to known Radiolaria. The small size of the 

 Pre-Cambrian bodies compared with undoubted recent 

 Radiolaria is marked but is of course accounted for. Dr. 

 Rust who examined the Pre-Cambrian bodies thinks some 

 of them move like Foramenifera than Radiolaria. That 

 they are organic forms there is no doubt. 



In the words of Gr. J. Hinde, '' the importance determ- 

 ining the real character of the minute bodies in these 

 Pre-Cambrian rocks will be generally recognized and we 

 trust the author will persevere in his researches until he 

 meets with evidence suflBcient to convince those who 

 now feel some hesitation in accepting his conclusions 

 about them." 



Walker Prizes in Natural History. 



By SAMUEL HENSHAW, SECRETARY. 

 Boston Society of Natural History, Boston, Mass. 



By the provision of the will of the late Dr. William 

 Johnson Walker two prizes are annually offered by the 

 Boston Society of Natural History for the best memoirs 

 written in the English language on subjects proposed by 

 a committee appointed by the Council. 



For the best memoir presented a prize of sixty dollars 

 may be awarded ; if, however, the memoir be one of 

 marked merit, the amount may be increased to one hun- 

 dred dollars, at the discretion of the committee. 



For the next best memoir, a prize not exceeding fifty 

 dollars may be awarded. 



