AMPHIPODA — STEBBING. 583 



lobes having acute apices which meet or even cross ; the 

 mandibular processes narrow. Mandibles narrow, except at, 

 base, cutting-plate forming a tongue-like widening, witliout 

 teeth (except that in one specimen there is a minute 

 projection at each end of the cutting edgp) ; there is no 

 secondary plate or molar. All three joints of the palp rather 

 long, second longer than the first, both smootli, third slightly 

 longer than second, with three spinules at the apex. First 

 -maxillae seemingly with small unarmed inner plate, outer plate 

 long and narrow, narrowing distally, then widening a little where 

 five spines form an oblique apical vow. No vestige or vestigial 

 mark of palp could be seen in the flattened maxillae of the smaller 

 specimen, but in the folded maxillae of the larger specimen there 

 is a very doubtful appearance of such a vestige. Second maxillas 

 with few spines on oblique apex of inner plate and a few on the 

 still more oblique apex of the much longer outer plate, the distal 

 spines of which are long. Maxillipeds membranaceous, having a 

 few spines at the apices of the extremely narrow inner plates, the 

 outer plates reaching a little beyond them and together forming 

 a narrow oval, with two or three spinules distally on the inner 

 margins. 



First gnathopods, having the second joint the longest and 

 widest, narrowing downwards, third joint longer than fourth, as 

 commonly in the second gnathopods of the Lysianassidpe, and as in 

 the first gnathopods of some species of the genus Iphimedia, fifth 

 joint subequal in length to the slender slightly-curved sixth, 

 which has its apex occupied by the small finger, so as to be in no 

 degree subchelate, thus differing from the chelate but otherwise 

 I'ather similar limbs of Iphimedia minida, Sars, and Odius 

 carinatus (Bate). Of the latter species the lips and maxillae are 

 also reminiscent. Second gnathopods — side-plates deep, second 

 joint in width equalling (true length of) the side-plates, third joint 

 much shorter than the conical fourth, fifth on its outer margin 

 subequal in length to the narrow palm-less sixth, beside which 

 its under margin is pi'oduced into a long sharp tooth, the tip of 

 which maybe opposed to the little unidentate finger, thus making 

 the limb complexly subchelate. The branchial vesicle is long 

 and narrow, the marsupial plate extensive. 



The first peraeopod has the side-plates deeper than those of the 

 second gnathopods, those of the second peraeopods are less deep 

 but wider, with the lower part of the hind margin excavate. In 

 these liinbs the second joint is moderately wide with sides nearly 

 straio-ht. third joint short, conspicuously narrower than the fourtli 

 joint* fifth decidedly longer than fourth, sixth slightly longer than 

 fifth, finger long, narrow, curved. Marsupial plates extensive. 



Third, fourth and fifth peraeopods very similar to one another 

 And to the preceding pairs, but with the second joint more 



