120 DE, H. J. HANSEISr ON THE INQOLFIELLIDiE, 



Mouth. — The labrum (fig. 4) is considerably broader than long, 

 rounded on the sides ; the posterior margin with the middle 

 half rather strongly convex. — The left mandible is shown from 

 below and a little from the outer side in fig. 5, while fig. 6 exhibits 

 its distal half from behind and below with a higher degree of 

 enlargement. The cutting-edge is rather short, with a submedian 

 incision. The movable lobe, 'lacinia mobilis ' (Z.), consists of a 

 large plate and four setse ; the plate has both the anterior and 

 the posterior angle of the terminal edge produced into a small 

 tooth, while the setae are very thick and increase much 

 m thickness towards the end, which has an incision on the 

 termmal margin. The molar process {on.) is very curious, heing 

 shaped as a very long, very slender, and nearly straight cone, 

 the distal part of which is exceedingly slender with the apex 

 acute. A mandibular palp is wanting. The right mandible has 

 been seen only from below ; some smaller differences exist most 

 probably between it and the left mandible in the shape of the 

 cutting-edge, and especially of the movable lobe, but the molar 

 process is formed as that of the other mandible. — The hyjpopharynx 

 (paragnatha) (fig. 9) has a very oblique, rather thick lobe on each 

 side ; the lobe terminates anteriorly near the median line in an 

 obtuse end adorned with a couple of very short setse. — The 

 maxillulw (fig. 7) are interesting, but I have not been able to 

 make out the elements of their basal portion. The inner lobe 

 (originating from the first joint) is rather well developed, with 

 two short sets3 on its terminal margin ; the outer lobe (originating 

 from the third joint) is strong, distally truncate, with about five 

 very thick setse, and three of these are adorned with branches on 

 their inner side. The palp is well developed, and consists, as in 

 most Gammarina, of two joints, but the first is longer than in any 

 other Amphipod known to me, much longer and somewhat 

 broader than the second joint, which has four elongate setse on 

 the terminal margin. — The maxillce (fig. 8) are much smaller 

 than the maxillulse ; the basal elements could not be distinguished 

 from each other ; the two lobes are rather short and broad, with 

 some long and moderately strong setse on the terminal margin, — 

 The maxillipeds (fig. 10) are long, seven-jointed ; the first joint 

 of one maxilliped is coalesced in slightly more than two-thirds of 

 its length with the corresponding joint of the other appendage ; 

 the second joint is on the inner half of the upper side produced 

 into a lobe which is not marked off by any suture, reaches almost 



