AND ON THE NORTH EAST COAST OF ENGLAND. 57 \ 



six-jointed antennules and in some other minor points. The 



only described species with six-jointed antennules is C. v 



cequoreics, Fischer, a brackish water form which diflfers in 



many ways from the present species. 



Genus AMEIRA, Boeck. 



Ameira amphibia, sp. nov. (PL I., figs. i-ii). 



In general outline and appearance much like Canthocamptus 

 (fig. i). Head and thorax coalescent ; no distinct separation 

 between thorax and abdomen, which are nearly equally stout ; 

 caudal segments very short, about half as long as broad and 

 not more than half as long as the last abdominal somite, the 

 posterior margin of which is fringed with spine-like setae, the 

 preceding segments being setiferous only near the sides (fig. 

 11) : seen laterally the caudal segments are only half as deep 

 as the preceding ones, the last abdominal segment projecting 

 abruptly beyond them dorsally. Antennules (fig. 2) very 

 slender, short, clothed with very delicate setae, eight-jointed, 

 the joints nearly equal in length, the fifth, however, being 

 somewhat shorter than the rest. Inner branch of the antenna 

 (fig. 3) minute, two-jointed, bearing three short setae. Man- 

 dibles (fig. 4) extremely small, the shaft rather feebly toothed \ 

 at the apex, palp minute, composed of two joints, each of 

 which bears two or three setae ; maxillae (fig. 5) and anterior 

 foot -jaws minute, but in general structure similar to those of 

 most Canthocamptinas ; posterior foot-jaws (fig. 7) short and 

 rather stout, hand oval, claw slender, slightly curved, and 

 about as long as the hand. All the swimming feet have both 

 branches three-jointed, inner branch of the first pair (fig. 8) 

 longer than the outer branch, the first joint rather stout, and 

 about twice as long as the united lengths of the following two, 

 its inner margin fringed with setae; second and third joints 

 short, nearly equal, the third bearing three, the second 

 one long apical setae; outer branch equally three-jointed, 

 spines of the external margin long and slender, as also are the 

 apical setae, firs and second joints marginally ciliated ; second, 



