TANAIS DULONGII. 1S 
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 THE NOTHE, WEYMOUTH, 
ain ~* 
