STEBBING— ISOPODA 87 



setae. The third joint is extremely short, while the fourth is exceptionally long and 

 provided with a fringe of very long plumose setae, the fifth joint is short, and might pass 

 for a member of the five-jointed flagellum, which by its help would just equal the length 

 of the fourth joint of the peduncle. 



The mandibles proved to be exceedingly brittle, but most of their characters could 

 be made out. They have the long narrow trunk and strongly projecting molar as in 

 Apseudes. Each has a pellucid curved strap-like plate, strongly projecting and carrying 

 apically four to five spines, representing the spine-row. Between this and the stout 

 dentate cutting edge one mandible has a delicate slightly denticulate accessory plate, 

 which is not represented on the other mandible, where the cutting edge is surmounted 

 by a rather conspicuous tooth on the upper margin. The palp, which is a very distinctive 

 feature, was unfortunately in each case broken, so that the jointing remained obscure. 

 Possibly there is a coalescence of the first and second joints, with a third joint about 

 half the length of these two combined. In any case the palp is very large and closely 

 fringed on the inner margin with very long plumose setae, a feature not found in other 

 members of the family. 



The first and second maxillae were not very clearly made out, except as regards 

 the outer plate, which in each is distally widened, in the first maxillae carrying some 

 eleven short apical spines, in the second short apical setae. 



The maxillipeds are six-jointed, with a large epipod, the plate of the second joint 

 fringed on the inner and distal margin with short spines, the third joint short, the three 

 following rather long, successively longer and all three closely fringed with long plumose 

 setae, the longest at the apex of the last joint. The latter characters make these 

 appendages apparently unique in this family, so far as at present known. 



The first gnathopods are of the usual pattern, the second joint carrying a very small 

 two-jointed setiferous exopod, the third and fourth joints coalesced, short, the fifth very 

 long, fringed with closely set plumose setae of great length, an exceptional feature, the 

 two following joints forming a chela, with the thumb broader than the movable finger, 

 their acute apices crossing when their straight denticulate inner margins are closed together. 

 The front margin of hand and finger is convex, and near to that of the hand there is 

 an open fringe of plumose setae. Hind margin of hand sinuous. 



Second gnathopods stouter than first ; exopod of the stout second joint apparently 

 a single-jointed rudiment, third joint short, fourth nearly as long and stout as the second, 

 fifth short, with two stout spines on hind margin, sixth joint shorter than fifth, broader 

 than long, with four stout spines on hind margin and one on apex of front, these spines 

 being minutely pectinate on both edges ; the finger nearly as long as the hand, slightly 

 curved, broader at the rounded apex than at the pellucid base, and apically surrounded 

 by a bush of setiform spines or spiniform setae, presenting as a whole a very singular 

 character. 



First and second peraeopods closely alike, distinguished from the others by the great 

 length of the slender, curved finger, which is twice as long as the sixth joint, that and 

 the bulkier fifth having each four conspicuous but slender spines on the hind margin. 



Third and fourth peraeopods closely alike, the finger narrow, straight, blunt-ended, 



