REPORT ON THE AMPHIPODA. 619 



they pass round to the outer margin, on which lower down there is a fifth ; below the 

 corner tooth on the outer side of the plate are two strong spines ; the broad outer 

 plates, reaching nearly to the apex of the second joint of the palp, have on the inner 

 margin a score of small teeth set close together, followed by a separate single tooth on 

 the apical margin, which in turn is followed by eight spines passing round the apical 

 and some way down the outer margin ; the second joint of the palp is a little longer 

 than the first and much longer than the third ; the finger is not very long. 



First Gnathopods. — Side-plates very broad, broader above than below ; first joint 

 extending beyond the side-plate, broad, with setae extending down about two-thirds of 

 the front margin ; the third joint with a short front margin and a long hinder one, which 

 is furred, and near the produced pointed apex carries a row of spines ; the wrist rather 

 shorter than the hand, has the long front margin clear, except for the row of long spines 

 about the apex ; the hinder margin is furi-ed and also has spines about the apex ; there 

 is a ridge or pocket on the inner side parallel with the furred part of the margin ; the 

 hand is broad and long, at the base nearlj' as broad as the wrist distally, furred on the 

 hinder margin near the base, and here having on the side a ridge or fold of the skin 

 parallel with the margin ; there are various groups of spines or setse on the hind 

 margin and surface of the hand and at the front apex ; the finger closes down between 

 the two spines, which define the sloping apical palm. 



Seco7id Gnathopods. — Side-plates widening downwards, at the top much less wide 

 than those of the first pair. Branchial vesicles expanding greatly from a narrow neck, 

 narrowed below ; marsupial plates moderately broad. First joint extending much 

 beyond the side-plate, equal in length to the third, fourth and fifth joints together, with 

 a few setae on the front margin ; second joint as long as the wrist ; third joint shorter, 

 front margin free for some distance, hind margin furred below, and with a large group 

 of long, thin spines on the rounded apex ; wrist very lightly furred anteriorly, but 

 strongly behind, also towards the distal end carrying numerous groups of slender spines 

 of various lengths ; one such group at the apex in front ; the hand shorter than the 

 wrist, but elongate, the sides but little curved, much furred all along, while the centre 

 of the surface on both sides of the hand is naked or nearly so ; in addition to the 

 furring, both edges and adjacent parts of the hand are crowded with groups of spines, 

 those in front when they reach the apex standing out far beyond the finger ; they are 

 pectinate, very slightly curved ; the finger is very small, closing down on a palm, the 

 outer part of which is nearly straight, at right angles to the hinder margin of the hand. 



First Perseopods. — Side-plates with the hind margin straight; marsupial plates 

 expanded a little below till near the apex, having on the lower half and apex numerous very 

 long setae in front and a few short ones behind. Fu'st joint of the limb not reaching the 

 lower rim of the side-plate ; third joint longer and stouter than either the fourth or fifth, 

 slightly decurrent in front, with groups of long, slender spines or setae on the hinder margin. 



