280 REVIEW. 



mena known to him among the invertebrate relatives of the 

 Vertebrata, such as Annelida, Gephyrea, and Mollusca. 



The work is illustrated by ten very beautiful plates, 

 executed in Germany, the expense of producing which was 

 borne by the Government Grant Committee of the Royal 

 Society. The researches were conducted in the laboratory of 

 the Brown Institution, under the management of the Uni- 

 versity of London. We are glad to see such valuable work 

 appearing under the auspices of these learned bodies. 



