130 TANAIDJE. 



mens from the coast of Devonshire which have served 

 for our work, although the general resemblance is so 

 great that we prefer to consider them as belonging to 

 that rather than to any of the species described by 

 Kroyer. The species has indeed been recorded, without 

 any expression of doubt, as a native of the Irish coast 

 by the late W. Thompson, Esq., but the specimens 

 which were so regarded by him prove on examination to 

 be mutilated specimens of an amphipodous crustacean. 

 Some differences, however, exist between our specimens 

 and Savigny's figures of the terminal portion of the body, 

 which we are inclined to regard as arising from inac- 

 curate drawing on the part of Savigny rather than as 

 really existing. 



The body is of moderate length, smooth, and desti- 

 tute of hairs, especially on the segments of the tail. 

 The upper antennae are strong, porrected, and nearly as 

 long as the large following segment ; they are composed 

 of three joints, of which the basal is the largest and 

 terminated by a pencil of hairs. The lower antennae 

 (represented too highly magnified in figure c) are rather 

 shorter and more slender than the upper pair, and five- 

 jointed, having a very short basal and a short third joint, 

 the fifth joint terminating in a few hairs. The large 

 first pair of legs are terminated by a didactyle claw, of 

 which the immovable finger is strong and truncated 

 along its inner edge, which is slightly denticulated, 

 whilst the terminal movable finger is slightly serrated 

 along its inner edge. The second pair of legs are rather 

 longer and more slender than the third pair, the five 

 remaining pairs being nearly equal in size. The second 

 pair of legs are gradually attenuated to the tip, the finger 

 being slender, acute at the tip, and but slightly bent. 

 In the third pair the terminal joints are wider ; the fifth 



