MEMORANDA. 55 



ceedingly small (^-^^ of an inch), whilst the difficulty of 

 close observation was further increased by the debris of the 

 genitalia of the Synaptse, with -which it was always con- 

 nected. Mr. Gosse has kindly given me his oj)inion as to 

 the Rotifer, which he regards as likely to prove the type of 

 a new genus ; but no definite opinion is warranted by my 

 fragmentary observation. Associated with the Rotifer in 

 the body-cavity of the Synapta was also a very active Ti^i~ 

 chodina, very similar to that infesting the common Hydra 

 viridis. — E. Ray Lankester, Christ Church, Oxford. 



