CrMODOCEA EMARGINATA. 429 



the flagellum of the upper pair (represented without the 

 two basal joints in the middle right-hand figure), are fur- 

 nished with flattened hairs at the tips. The foot-jaws 

 have the three middle joints produced into long lobes, 

 strongly ciliated at the tips, a portion of the cilia of the 

 penultimate joint being set on at an obtuse angle to the 

 rest. The basal portion of the tail has the middle of the 

 hind margin extended backwards and emarginate, with 

 a more or less distinct tubercle on each angle of the 

 emargination. The middle of the upper surface of the 

 terminal joint has two larger tubercles, followed by a 

 depressed space, terminating generally in an erect tooth 

 or obtuse point, the extremity of the joint armed with 

 three obtuse points. The lateral appendages are very 

 rugose and ciliated, the outer division nearly oval, but 

 produced on the outside, at the tip, into a point; the 

 inner division is narrower and curved, with the tip 

 pointed. 



Dr. Leach took this species at Plymouth, under Mount 

 Edgecombe. Mr. John Cranch found specimens, less 

 strongly granulose, at Falmouth. We have received it 

 from near Glasgow, taken by Mr. Robertson. The late 

 Mr. W. Thompson found a specimen within the shell of 

 a Balanus, affixed upon a Modiola vulgaris, from Belfast 

 Bay. 



