ISOPODA. 39 



setae, and these are plentifully distributed over the rest of the appendage. Nowhere 

 are they conspicuous. 



The first maxilla is a two-lobed structure, of which the inner is short, narrow and 

 slightly curved ; its inner margin is fringed with fine setae, and the distal extremity is 

 occupied by three stout, plumose setae. The outer lobe is much larger and broader, its 

 distal margin being fringed with about ten stout spines. 



The second maxilla consists of a broad lobe rounded distally, the inner distal 

 margin is armed with short and stout plumose setre ; towards the outer margin the 

 setae become longer, more delicate and much less plumose. Of the two external lobes 

 the outer one is half the size of the inner and is armed distally with a few strong setae, 

 which are thinly plumose, those of the inner lobe are more numerous and intermediate 

 in character. 



The maxilliped presents quite a normal appearance. It rests on a broad plate 

 which is nearly rectangular, but rounded on its outer side. The masticatory lobe is 

 in two pieces ; the proximal one being a little shorter than the distal, which has its 

 outer margin rounded. Distally it is armed with short, stout, slightly curved setae, 

 which appear to be finely toothed rather than plumose. The palp does not present 

 any special peculiarity ; the first three joints progressively increase in length, the other 

 two decrease ; all are stoutly built and are provided in the usual way with long setae. 

 The epiguath rests on a triangular plate of which the angles are rounded and the 

 base is anterior ; it is large and unequally oviform, the inner margin being nearly 

 straight. 



The first appendage of the mesosorne, or gnathopod, does not differ essentially in 

 its structure from that of the other species here described. The basis is stout, 

 constricted near the base and rather irregular in outline ; the three following joints are 

 quite normal and plentifully provided with long, simple setae. The propodus is 

 supplied with long, simple setae along its ventral margin, but on its inner face, that 

 applied to the body, there are, towards the dorsal aspect, some half-dozen series of 

 long setae as well as others near the ventral margin, which are finely toothed rather 

 than plumose. A rounded process on each side of the extremity of the propodus 

 receives the dactylus. This is well provided with simple setae, and the terminal claw is 

 accompanied with an auxiliary more than half its size. 



The three following pairs of appendages are fringed with long, simple setae from 

 the distal extremity of the basis. The first pair is the shortest, the other two sub- 

 equal, the basal joint of the third being the largest and most spinous, but the three 

 terminal joints are each rather smaller than on the preceding appendage. Externally 

 the basis is provided with four stout spiuous processes. The next joint has one very 

 large one ; the merus has two, a small proximal one and a large distal one ; the carpus 

 has but one of moderate size. The number of these spines only concerns this 

 particular individual, they vary both in number and strength. The centre appendage 

 has a length of 10 mm. on a body length of 20 mm. 



