466 ON A MARINE SPECIES OF PIIILOUGRIA. ', 



I attach some importance to the peculiar seta arising from the 

 dactylos of each thoracie leg, it appears to be very constant, and 

 will, I think, aid in recognising the species ; a seta similar, but 

 quite distinct in form, is found in the species common in Canterbury, 

 New Zealand, which I have identified with Philougria rosea. 



The pleopoda, except the terminal pair, are very delicate ; they 

 consist of a basal portion much broader than long, which bears two 

 broad plates, the inner one the smaller and without seta?, the 

 outer one supplied with several rather long very delicately 

 plumose seta?, and between these several very small delicate 

 simple seta?. 



Description or Plate XI. 



Fig. — 1. Philougria marina, xl9. 



Fig. — 2. Outer antennae of same, x45. 



Fig. — 3. Mandible of same, xl80. a. End of same (compressed) x350. 



Fig. — 4. Thoracie leg of same, x83. a, dactylos of same more highly 



magnified. 



Fig. — 5. Pleopod of same, x72. 



Fig. — 6. Extremity of abdomen of same, x45. 



