32 



and weighing 52 J grammeis, was torn off from its attach- 

 ment to the glass and placed on the sand in the bottom 

 of the tank. In four days it had re-attached itself to the 

 glass by means of byssus threads. This shows, if any 

 further demonstration was really required, that even 

 Mussels which have attained to large size have the power 

 of spinning fresh byssus threads by which they become 

 anchored to surrounding objects. 



SECTION IV. 



Description of New and Kare Copepoda. 



(By Mr. Andrew Scott.) 



Family H[aupacticid.e. 



Sunaristes ijaguri, Hesse. 



This rather peculiar and interesting species was obtained 

 by washing the shells of Buccinum inhabited by the 

 hermit crabs Pagurus bernhardus, collected in the trawl- 

 net of the steamer while working at the mouth of the 

 Mersey estuary on the 23rd of July, 1895. It seems to be 

 a comparatively rare species and so far as is known this 

 is only the third time it has been found in British waters. 

 From our present knowledge of its distribution it appears 

 to be confined to areas having large volumes of brackish 

 water passing over the bottom, and has not been found in 

 pure sea-water. 



Sunaristes pag2iri is not unlike Canuella perplexa in 

 general appearance but is readily distinguished from that 

 species by the structure of the various appendages, 

 especially the antennules and second pair of swimming 

 feet of the male, 



