TANAIS DULONGII. 



131 



pair are furnished at the base on the inside with a small 

 movable appendage, which we consider as being the 

 homologe of the branchial organ of the amphipodous 

 Crustacea ; the two hinder pairs are more robust, and 

 better fitted for prehension, with the fingers strong 

 and hooked. The tail is short, scarcely longer than 

 wide, and terminated by two short slender three-jointed 

 filaments. 



The only individuals which we have seen of this 

 species were sent to us from Polperro by Mr. Loughrin. 



ISLE OF PORTLAND, FROM THF, NOTHE, WEVKOUTH. 



K 2 



