BATHYPORETA. 303 



second are slender and have the finger wanting. The 

 last pair of the caudal appendages terminate in two 

 branches, one being short, the other long and bi-arti- 

 culate. The central tail-piece is double. 



This genus, as far as we know, is confined to the 

 shores of Northern Europe. 



By a singular coincidence, in all the specimens that we 

 have seen the first pair of legs are damaged or wanting, 

 so that we have not been able to determine their 

 structure. We have, therefore, drawn up our character 

 of this important organ from the figure and description 

 of Lindstrtim. 



