REPORT ON THE AMPHIPODA. 1337 



little appendages at the apex of the hand which Claus figures. But that Milne-Edwards 

 in describing Daira was not thinking of a didactyle hand like this very clearly appears 

 from his remarks on Themisto, in which he says, " the second gnathopods are sometimes 

 imperfectly prehensile, the antepenultimate joint being compressed and prolonged 

 anteriorly so as to form a sort of hand and an immovable finger, on the upper edge of 

 which impinges the movable claw, which is conical and formed of the last two joints, an 

 arrangement exactly like that which we have just seen in the genus Daira." 



Paraphronima cuivis, n. sp. (PI. CLVIL). 



The Head of about equal length and depth, much deeper than the peraeon, nearly 

 equal in length to the first four of the perseon-segments together ; the seventh segment 

 of the peraeon the longest, yet not so long as either of the first three segments of the pleon, 

 which are also much deeper, with the postero -lateral angles rounded ; back of the animal, 

 except the head, obtusely ridged, peraeon scarcety, pleon rather more strongly. 



TJie Eyes occupy most of the surface of the head, and may be regarded as two pairs 

 very closely united, the larger pair occupying not only the summit but most part of the 

 sides of the head ; the much smaller second pair are near the lower margin, the little 

 ocelli of this pair radiating from a point in advance of the mouth organs. 



Upper Antennas straight, projecting from the triangular groove in the front of the 

 head; the peduncle short, the first joint considerably longer than the other two together, 

 widening distally ; the flagellum stout, lanceolate in outline, far longer than the peduncle, 

 the two together as long as the head ; the inside of the flagellum carrying a brush of 

 broad filaments and fringed with short setules which project along the lower margin and 

 at the apex ; the second joint is minute. 



Lower Antenna} inserted close to the mouth-organs, the first and second joints 

 coalesced with the head, but with the opening of the gland-cone distinct ; the third joint 

 nearly as long as the head, slender, directed forwards, slightly curved so that the 

 concave upper margin, which is closely fringed with setules, fits into the gently convex 

 channelled lower margin of the head ; the next joint is short, though longer than broad, 

 with some setules on the upper margin ; this joint bends downwards, the following, 

 scarcely longer and similarly armed, is in line with it, and so is the long straight 

 terminal joint, which perhaps alone represents the flagellum ; this is more than 

 half the length of the third (first free) joint, with convex lower or hinder margin, the 

 front or upper pretty closely fringed with filaments, of which the truncate yet almost 

 acute apex also carries a group. It is a question whether the long third joint represents 

 the third, fourth, and fifth joints of the peduncle in coalescence, leaving the three 

 remaining joints for the flagellum, or whether the two short joints are respectively the 

 fourth and fifth of the peduncle. 



(ZOOL. CHALL. EXP. PART LXV1I. — 1888.) Xxx 168 



