136 TANAID^. 



surface of every denticle. The second pair of gna- 

 tliopoda are but half tlie length of the first, being 

 slender, very feeble, and terminating in a slightly curved 

 styliform dactylos. The first two pairs of pereiopoda are 

 formed nearly like the second pair of gnathopoda, but 

 have shorter, therefore stronger, dactyla. The three 

 posterior pairs of pereiopoda are reversed from the 

 preceding in their mode of attachment, and have the 

 basal joint more robust than that of the preceding pairs 

 of pereiopoda ; in other respects they resemble them in 

 form. The five anterior pairs of pleopoda are alike in 

 size and shape ; they consist of a stout peduncle on each 

 side, and carry a pair of oval, membranous plates, 

 ciliated with long and strong hairs upon the outer and 

 inferior margins. The inner plate, if we may judge 

 from observation after death, is carried at right angles 

 with the outer, which rests pendant in the water. The 

 posterior or caudal pair of pleopoda consist of a single 

 multiarticulate branch, of which the basal joint is larger 

 than the terminal ones: it consists of nine or ten small 

 articuli. 



We are indebted for this interesting addition to our 

 British Fauna to the zeal and research of the Rev. 

 A. M. Norman, who took it during the summer of 1865 

 among Zostera between tide marks in Belgrave Bay, 

 Guernsey. 



The distinction between this and Dana's Feejeean 

 species exists in the latter having longer superior an- 

 tennas, as also more slender and longer gnathopoda, 

 which are only armed with a small rudimentary tooth on 

 the inner surface near the extremity of the fixed finger 

 of the great claw ; the posterior pair of pleopoda are 

 also longer, beixig described by the author as equal to 

 the pleon in length. 



