231 



2nd joint produced behind into a strong claw-like process. Posterior antennae 

 slender, with the basal part distinctly subdivided, outer ramus small, uniarticulate, 

 with 3 setse, 2 apical and one lateral. Mandibular palp rather large and dis- 

 tintly biramous, inner ramus much the longer. Maxilla? with the exopodal and 

 epipodal lobes well defined. Anterior maxillipeds with 4 distinct digitiform lobes 

 inside the claw-bearing joint, and having moreover 2 or 3 small setiferous ter- 

 minal joints. Posterior maxillipeds rather slender, with the terminal claw distinctly 

 biarticulate. 1st pair of legs more or less slender, and distinctly prehensile, 

 inner ramus much longer than the outer, and only consisting of 2 joints, the 

 distal one small and bent upon the 1st, carrying on the tip a slender claw and 

 a single seta. Natatory legs with the rami very unequal, the inner one being 

 much shorter than the outer and only consisting of 2 joints. Setse of both rami 

 much reduced in number. 4th pair of legs conspicuously differing from the 2 

 preceding pairs by the excessive length of the outer ramus and the rudimentary 

 condition of the inner one. Last pair of legs (in female) very large, foliaceous, 

 each constituting an oval concave plate without any distinct subdivision. These 

 plates are so arranged as to form, immediately beneath the genital segment, a 

 large bivalvular case, into which the ova are received, without being hold together 

 by any membranous envelop. 



Male unknown. 



Remarks. This genus has recently been established by Th. Scott, to in- 

 clude a species previously referred by him to the genus Tetragoniceps of Brady. 1 ) 

 The most obvious character of the present genus is unquestionably the very pe- 

 culiar transformation of the last pair of legs in the female, a feature not found 

 in any other known Copepod. It is indeed from this character that the somewhat 

 inconvenient polysyllabic generic name proposed by Th. Scott has been derived. 

 Two Norwegian species of this genus will be described below. 



149. Phyllopodopsyllus Bradyi, Scott. 



(PI. CLV). 



Tetrctgoniceps Bradyi, Th. Scott, Additions to the Fauna of the Firth of Forth. 10th Ann. Rep. 

 of the Fishery Board for Scotland. Part III, p. 253, PI. IX, figs. 1932. 



Specific Characters. Female. Body moderately slender and conspicuously 

 constricted in the middle. Cephalic segment fully as long as the 4 succeeding 



a ) Some oilier species, likewise at first referred to that genus, have by the same author 

 been removed as types of distinct genera (Pteropsyllus, Evansia, Leptastacus) . 



