978 THE VOYAGE OF H.M.S. CHALLENGER. 



Lower Lip as in Eusiroides csesaris, the lateral margins well rounded, so that the 

 apices of the mandibular processes are directed a little inwards. 



First Maxillae. — The inner plates loug and narrow, with three spines or setae on the 

 inner side of the apex ; of the ten long spines on the truncate margin of the outer plate, 

 the innermost has six lateral denticles, a shorter one beside it has three, the next beyond 

 it four, the remainder being apparently coutent with two or one, the denticles being in 

 most cases long ; the first joint of the palp half the length of the second, with one 

 spine on the outer margin ; the second joint widest at the middle, where it has one spine 

 on the convex outer margin ; two rows of slender spines, longer and shorter, fifteen in 

 number, fringe the oblique line from the apex to the point on the inner margin where 

 the plate is widest. 



Second Maxillse similar to those of Eusiroides pompeii. 



Maxillipeds very similar to those of Eusiroides pompeii, but the inner plates have 

 a series of five or six plumose setae beginning on the inner margin and passing on to the 

 surface some way short of the apex, the apical border having three curved spines on the 

 outer part, and on the inner four spine-teeth all less stout, and one much less so, than in 

 the other two species of Eusiroides ; the setae on the outer margin of the outer plate do 

 not descend so low as in either of those species ; the first joint of the palp is apically 

 acute, with spines on both sides of the point, the broad second joint has no spines on or 

 near the outer margin except the apical group ; the finger is more elongate, with a longer 

 and sharper nail than in the other two species, with a single spine on the inner margin, 

 and this in our specimen present only on one palp. 



First and Second Gnathopods like those of Eusiroides pompeii, but the hinder apex 

 of the third joint apparently not bidentate ; the hands are rather more swollen at the 

 middle, compared with the two extremities, than in either of the two preceding species, 

 so that especially in the second gnathopods there is a more definite separation of 

 the palm from the hind margin, yet not cpiite so marked a distinction as in the 

 figure gn.2. 



First and Second Perseopods similar to those of Eusiroides pompeii; the branchial 

 vesicles shorter ; the fifth joint of the limb with only seven groups of spines on the hind 

 margin instead of nine. 



Third Perasopods. — Side-plates with the hind lobe much deeper than the front. 

 Branchial vesicles narrowly oval, much smaller than the first joint. First joint more 

 oblong than oval, very broad, with a tuft of setae near the top of the front margin, 

 spines at four or five points below, the hind margin nearly straight, with few not deep 

 serrations, the lower margin broad and rather flat, to a great extent overlapping the 

 short second joint ; the third joint broad, decurrent behind, longer than the fourth ; the 

 fifth and sixth joints missing. 



Fourth Perieopods. — Side-plates with a deep hind lobe and a very small front one. 



