624 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



Lower antennae. Second joint rather large, folded; fifth longer than third or 

 fourth or than the single-jointed flagelluni, which is tapering, fringed with several 

 tufts of setae. 



Upper lij). See remarks on the genus. 



Mandibles, as in Calathura, but the third joint of the palp is short, with only 

 four or five spines. 



Lower lip slender and delicate, a longitudinal line down the centre perhaps marking 

 a cleft, but the length of the cleft, if any, could not be made out. There is a small 

 tuft of setules at each side of the apex. 



First maxillae, very long and slender, with eight minute retroverted teeth along 

 the distal part. In the dorsal view of the head (fig. C) these organs ^vill be seen 

 protruding from between the peduncles of the lower antennae, being in fact much in 

 advance of the mandibles. 



Second maxillae. These are slender, narrowing rather abruptly at some distance 

 from the apex, which carries two or three setules. With the lower lip they form a 

 narrow pipe. In the figure they are drawn apart to either side of the lip. 



Maxillipeds. The epipods are oval, exceedingly small. Not only is the joint to 

 which they belong indistinguishable, but the following pair of joints is likewise at 

 its base completely coalesced with its indistinguishable predecessor. The cleft dividing 

 this pair of unjointed joints is equal to the length of the palp, which, as in Paran- 

 thura nigroptinctata (Lucas), is curved and tapering, with some setae at the apex, 

 among which a minute second joint is with difficulty discernible ; a long spine-like 

 seta tips the inner apical angle of the basal joint. 



First gnathopods. Second joint not longer than third, but distally wider and 

 channelled, fourth much broader than long, cup-like, fifth small, triangular, sixth 

 broadly pyriform ni general contour, but the palmar margin with a produced point 

 at its base, between this and the finger having a close-set row of spinules on a 

 slightly convex region, to which succeed some spines and setae ; the narrow apex 

 forms a subcircular expansion beside the base of the finger in this and all the limbs 

 of the peraeon. Finger about two-thirds as long as sixth joint, its concave margin 

 fringed with a few setules. 



Second gnathopods and first peraeopods. Second joint rather longer than third, 

 fourth cup-like, broader than long, fifth triangular, under-riding the narrowly oval sixth ; 

 finger as in first gnathopod. 



Second to the fifth peraeopods. Second and thii-d joints as in preceding pair, 

 fourth longer than broad, fifth and. sixth narrow, fifth not under-riding sixth, more 

 than half as long; finger strongly curved, longer than the fifth joint. 



Uropods. Upper branch proximally broad, narrow apex just reaching beyond pe- 

 duncular portion of the lower branch, in which the terminal joint is not longer than 

 broad, much shorter than the peduncular part. 



Telson elongate oval, wider at the base than at the setose apex, which falls 

 somewhat short of the uropods. 



Colour (in spirit) pallid, faintly speckled on the back. 

 Length about 8 mm. 



