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 setae ; 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 
i 
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, wdiich has its 
outer margin rounded. Distally it is armed with short, stout, slightly curved setse, 
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 setse. 
The epignath 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 mesosome, 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 setse. The propoclus is 
supplied with long, simple setse 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 setse 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 spinous 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. 
