36 EEV. T. E. E. STEBBING ON AMPHIPODA FEOM 



maxillijieds Lencotho'e. In reference to this combination of characters tlie name of the 

 genus has been chosen, from the Greek word ai'a^tgi?, mingling. Among existing families 

 it stands nearest to the Leucothoidse, l)ut the extraordinary nature of the mouth-organs — 

 whether due to a parasitic mode of life or to a marital stage of existence, or falling under 

 any other exiilauation — so far isolates the species now to be described that it may have 

 to be placed alone in a separate family, Anamixidae, which would for the present bear 

 the characters of the genus. 



Anamixis Hanseni, n. sp. (Plate 11 ) 



The head is longer than any one of the perseon-segments, and is narrowed distally, Avith 

 rounded apex, with no distinct lateral angles. The second pleon-segment has the postero- 

 lateral angles acute, slightly produced ; those of the third are a little blunted. The fifth 

 segment is very short, scarcely distinguishable from the fourtli ; the sixth projects on 

 either side of the telson, in a way to suggest that the missing third pair of uropods may 

 be of a fairly large size. 



The eyes are round, placed in the middle of the sides of the head, consisting of about 

 eighteen short ocelli. 



First antenme. The first joint long and rather stout, the second nearly three-quarters 

 as long as the first, but much more slender, the third about two-fifths of the second ; 

 the flagellum eleven-jointed, a little longer than the first joint of the peduncle. A sensory 

 filament is present on several of the joints. These antennae dejiend from the head, being 

 inserted just below its apex. 



Second antenntB. These are inserted at the other extremity of the head. The first 

 two joints arc very small, the third is little more than half as long as the first of the 

 upper antennae, the fourth is slightly longer than the second in the other pair, and the 

 lifth is a little longer than the third joint of its own pair. The slender flagellum is four- 

 iointed, less than half as long as the penultimate joint of the peduncle. 



Mouth-organs. The underside of the head is slightly carinate, and apparently attached 

 to the keel there projects from between the second antennae a vertical plate, which may 

 be called the oral lamina. Its truncate front edge has some minute microscopic teeth. 

 With this curious and abnormal exception, no mouth-parts could be detected other than 

 the pediform maxillipeds. 



Maxillqjcds. The second joint bulges slightly on the upper or inner side, while on 

 the outer or lower side it has a shallow cleft, between two smoothly rounded apices, 

 which just overlap the bases of tlie third joint. The third joint has no lobe or lamina, 

 but in appearance is the basal joint of a five-jointed palp. Of the actual palp the first and 

 second joints arc about equal in length, tlie second the wider, carrying some setse on the 

 lower margin, the third joint is longer than either of the preceding, armed with several 

 setue, and having its surface minutely furred. The fourth joint or finger is slender, 

 strongly curved, nearly as long as the third joint. Owing to the absence of j)lates from 

 the joints of the protopod the palps are in close contiguity. The appearance is rather 

 that of legs than of mouth-organs. In dissection the head came easily away, leaving the 

 maxillipeds very firmly attached to the first gnathopods. 



