56 



parent object), and the terminal claw is usually more erect, a 

 condition seen in certain varieties of the European form, such 

 as those from the Clyde. 



The body-wall of the South African form has thicker 

 muscular layers, and the papillai seem to be more elongated 

 terminally than in the British, but preparation may be 

 responsible for this. 



The question, therefore, as to specific distinction is a delicate 

 one, and separation rests on the shortness and strength of the 

 bristles, with their slightly narrower transverse lines, the curves 

 and colour of the hooks, and the more consistent body. Future 

 investigation may show that the Mediterranean Siphotiostonia 

 diplochaUos of Otto, has relations both to the northern forms 

 and to those from the south. 



[Pubh.shed 5th February, 1904.] 



