236 EEV. T, E. R. STEBBING ON THE 



median membrane (whicli perhaps constitutes the lower lip) is found a bilobed mem- 

 brane, which we suppose to be the first maxilla ; it should be observed that the shorter 

 and narrower plate is really the inner, although the figure giving the ventral aspect 

 might give a contrary impression. 



The maxillipeds have the large irregularly oval second joint strongly furred on the 

 outer margin, the inner produced to a small pointed plate carry two coupling-spines ; 

 the third joint is very small, the fourth a large oval, longer than the fifth and sixth 

 joints combined, of which the sixth is the longer, all the last four joints having the 

 outer margin closely fringed with long plumose setse. 



The first gnathopod, of the usual opercular form, has a minute tooth-like terminal 

 joint, the preceding joint longer than the antepenultimate, these two carrying setse as 

 well as having their margins furred ; the large compound joint has finely feathered 

 setee mingled with the fur of its convex margin, which is probably the true outer 

 margin, though in the limb's opercular function it becomes the inner. Adjacent to 

 the opposite margin of the maxilliped is a firmly bordered narrow plate, suggestive of 

 a possible second maxilla, but in attachment to a membrane which perhaps carried the 

 maxilliped between the gnathopod and the plate in question. 



The second gnathopod is, as usual, completely leg-like and slender, the joints from 

 the second to the fifth all furnished with setse more or less elongate. 



The first perseopod is in close agreement with the second gnathopod. The second 

 perseopod has a rather remarkable appearance, suggesting the s^secific name, from 

 the Greek OiSt'wov?, the tragic king, with swollen feet. The third joint is large and 

 greatly dilated distally, the projecting outer apex fringed with short stout spines ; the 

 much smaller fourth joint is also distally dilated, and it is the combination of these two 

 seen at various angles when the limb is attached to the animal's body that produces 

 the odd effects of a decidedly gouty limb. The third perseopod is not eccentric, but the 

 fourth is noticeable for the shape of its fifth joint, which commences with a breadth 

 nearly equal to that of the broad fourth joint, but ends scarcely wider than the narrow 

 fifth, this convex inner margin being handsomely fringed with a dozen spines. 



The pleopods all carry distal fringes of plumose sette, which in Gnafhia has been 

 accounted as characteristic of a male not fully adult. It may be so in this case, but, as 

 will be seen in the figure of the second pleopod, the masculine appendage is there 

 developed, and the points of attachment indicate the accidental loss of numerous 

 setse. 



The uropods are long and narrow, the rami subequal one to the other and to the 

 telsonic segment, both carrying numerous long seti3e, which are much more finely 

 feathered than those of the pleopods. 



The length of the specimen was 5*5 mm. 



Taken by the ' Porcupine' Expedition in 1869, on Kockall Bank, from 109 fathoms 

 (Station 24, lat. 58° 26' N., long. 14° 28' W.). 



