POECELL1D1UM. 167 



2. PORCELLIDIUM FIMBRIATUM, CldUS. PL LXX, figS. 1 4. 



Porcellidiumfimbriatum, Clans. Die frei-lebenden Copepoden, p. 

 140, t. xxii, fig. 1 (1863). 



Body scarcely at all attenuated behind, broadly 

 oval, width equal to two thirds of the length ; integu- 

 ment pitted, as in the preceding species. Mouth- 

 organs and swimming-feet scarcely different from 

 those of the previous species. Fifth pair of feet (fig. 

 1 a) forming two broadly triangular plates, with finely 

 ciliated margins, between which the caudal segments 

 are intercalated ; last thoracic segments (fig. 1 b) 

 produced backwards into long triangular laminse, 

 which reach as far as the apices of the fifth feet. 

 Caudal segments (c) elongated, broad, laminar, with 

 broad, finely ciliated extremities. Colour yellowish or 

 pale olive, often tinted with red and violet. Length 

 -^th of an inch (1 mm.). 



P. fimbriatum, like the rest of the genus, occurs 

 chiefly on the fronds of Laminarice and other seaweeds ; 

 it is also sometimes taken by the dredge in consider- 

 able numbers, in localities where decomposing Algae 

 and other vegetable matters are deposited. Clifden, 

 Birtirbuy and Ventry Bays (Ireland) ; Cumbrae and 

 Portincross (Firth of Clyde) ; St. Mary's (Scilly) ; 

 Alnmouth (Northumberland) ; Oban, Hills wick, and 

 Lerwick (Eev. A. M. Norman). 



