92 J. R. KiNAHAN on the Britannic Species of 



The external maxillipeds, when extended, surpass the rostruna by their 

 sixth and seventh articulations ; their coxas are somewhat quadrilateral, and 

 connate with their own somite and the succeeding; their basis short, somewhat 

 triangular ; their ischium double the length of the basis, four-sided, its inner 

 side hollowed longitudinally, two-edged, the innermost armed w^ith rows of fine 

 teeth. The meros is remarkably twisted, dilated at its base, much longer than 

 the ischium, bears four cylindrical teeth on its outer edge, terminates in a 

 pointed tooth, and is fringed with long hairs. The carpus is much shorter 

 than the meros, twisted en revers, and rounded. The propodos is much longer 

 than the carpus, cylindrical ; tlie dactylos extremely short and blunt. The 

 last three joints are clothed with hairs. A four-jointed appendage arises from 

 the coxa. 



The eyes are short ; the scale rounded (vide Figure ). 



The abdomen is much narrower than the cephalo-thorax, smooth ; the 

 edges of the somites ciliated. 



In the male it bears six pairs of appendages, and in the female five, the ap- 

 pendages of the first segment being absent, and the somite itself deficient below. 



In the male the first pair is made up of two free joints, and the connate 

 coxa. The terminal joint, broadly dilated, twisted, and hairy. The second arti- 

 culation has three free joints and the connate coxa, the terminal joint (meros) 

 as in the last. The three succeeding limbs are four-jointed ; the coxa soldered 

 as before; the basis {nide Fig.) dilated into a broad plate ; the apex rounded and 

 hairy, its inner side deeply and truncately notched. From this uotcli arise 

 the ischium and carpus, which are cylindrical and sliort, conjointly barely at- 

 taining the dilated apex of the basis ; the outer side of the basis is ciliated. 



In the female the first pair are wanting; the second to fifth four-jointed, 

 flattened, slender, and haired. 



The sixth pair in both sexes is made up of ischium, basis, and connate 

 coxa, the ischium dilated ; a broad appendage is articulated to the coxa and 

 basis. 



Length of the largest specimens I have met, two inches and a half or three 

 inches, including outstretched chelce four and a half inches. The subjoined 

 measurements are taken from an individual captured at Sandycove, and repre- 

 sents a medium adult specimen: — 



