3i4 NOTES AND MEMORANDA. 



Claus finds in Aurelia another sense organ present on the dorsal 

 surface of the plate which covers each marginal sense organ, in 

 the form of a pit, lined by an epithelium of sense-cells. He 

 interprets it as olfactory in function. 



We may point out in conclusion that the structural features 

 of the nervous system brought to light in the investigations of 

 which we have given an account are exactly such as might be 

 deduced from the physiological investigations of Mr. Eomanes. 



F. M. Balfoue. 



