578 Scientific Proceedings, Royal Dublin Society. 



indebted to Mr. Carpenter, who has kindly named specimens for 

 me. 



I intend extending these observations, with improved photo- 

 graphic apparatus, to as many of the groups of the Arthropoda a& 

 I can obtain living specimens of. I am in hopes of obtaining 

 more accurate and interesting results by means of a photographio 

 apparatus which will give several successive pictures of the same 

 individual, with a very short interval of time between each. 



