REPORT ON THE AMPHIPODA. 699 



upper antennjB. In regard to the first joint of the flagellum of the upper antennae, 

 Amar^yllis must stand as an exception within the family. 



To suit the transfer of the genus to a different family, the following new definition is 

 proposed : — 



Upper Antennie, contrary to the general character of the family, having the second 

 joint of the peduncle not very short, and the first of the flagellum not very long, devoid 

 of a conspicuous brush. 



Mandibles. — The spine-row containing many spines ; the molar tubercle ciliated, not 

 dentate ; the palp set behind the middle of the trunk. 



First Maxillw. — The inner plate carrying two plumose setas ; palp wanting. 



Maxillipeds. — The inner plates reaching beyond the first joint of the palj) ; the outer 

 plates large, without spine-teeth ; the fourth joint of the palp small, obtuse, without a nail. 



First Gnatliopods, not subchelate. 



Side-plates of the fourth person-segment greatly developed. 



Telson cleft. 



Amaryllis hathycephalus, n. sp. (PL XXVII. ). 



Head very deep, rostrum minute, the sides of the head scarcely outdrawn in a 

 flattened lobe between the upper and lower antennae, this sinuous portion being marked 

 oS" from the lower part by a small incision ; the last two segments of the perfeon deeper 

 than those preceding them ; the first three segments of the pleon with the postero-lateral 

 angles acute, in the third segment abruptly upturned so as to leave a little pocket low 

 down in the hinder margin of the segment ; the dorsal depression of the fourth segment 

 very shallow. 



Eyes large, inversely lageniform, being larger above than below, the ocelli small. 



Up>per Antennse. — First joint cylindrical, more than twice as long as broad, equalling 

 in length the two following joints of the peduncle added to the first of the flagellum ; 

 the second joint rather longer than the third, the third longer than the first of the 

 flagellum ; the flagellum of ten or eleven joints successively decreasing in thickness, all 

 provided with long cylinders, the first joint not longer than the second ; the secondary 

 flagellum of three joints equalling in length the first three of the primary. 



Lower Antennse shorter than the upper, the peduncle rather longer than that of the 

 upper antennse; first joint strongly lobed below, gland-cone slight but prominent, third 

 joint short, fourth rather longer and thicker than fifth, equalling in length the first three 

 of the flagellum ; flagellum slender, of nine joints, of which the first is the longest. 



Mandibles. — Cutting edge very slightly convex, with a tooth above and another below ; 

 secondary plate of the left mandible widened distally and divided into five or six not very 

 prominent teeth ; spine-row of several short spines set among cilia ; molar tubercle weak, 



