PHILORTHRAGORISCUS SERRATUS. 143 



Also the feet in Echthrogaleus agree in their appearance 

 with those of Dinematura though they are destitute of the 

 wing-like processes of the basal joint. 



Attached to one of the females I found a small specimen , 

 which I presume to be a male, though dijffering in many 

 regards, especially in the less slender shape, from the 

 male of Dinematura and Echthrogaleus^ as these have 

 been described by P. J. van Beneden ') and Olsson ^). The 

 animal (fig 12) has a length of 4V2 mm. and agrees in 

 general shape with the female , though it is somewhat more 

 elongated ; this is especially due to the abdomen being 

 narrower and the caudal stylets being visible throughout 

 their whole length. The genital segment is elliptical, with 

 a plain margin , bearing only two spines on each side : a 

 smaller anterior one, placed on a third of its length and 

 a larger one situated more backwards. Also the dorsal shield 

 is present , but it is much shorter , covering hardly a fifth 

 of the genital segment; it is deeply notched, with a coarsely 

 crenulated posterior margin. 



The limbs of the male generally agree in their structure 

 with those of the female , they are only more slender , f. i. 

 the posterior antennae are not claw-shaped, but faintly 

 curved. Only the third pair of swimming feet (fig. 9) 

 shows a highly remarkable modification in its feature , 

 being partially transformed in a prehensile apparatus. The 

 outer branch of the feet agrees in shape with that of the 

 female and the mesial swimming plate of the basal joint , 

 though less developed , is also present ; however the inner 

 branch , instead of being two-jointed , consists only of a 

 single joint of an irregular rectangular shape. It bears 

 still three plumose setae on its distal end , like in the 

 female, but upon the inferior margin it is armed with a 



1) Bulletin de I'Acad. roy. de Belgique, 3e Sér. T. XXIII, 1892, p. 231, 

 pi. IT, figs, 11—13. 



2) Prodromus faunae Copepod. parasit. Scandinaviae; Lunds Univ. Arsskrift, 

 T. V, p. 18, pi. 1, flg. 6. — I regret that I had no opportunity to see Thomson's 

 paper on the Parasitic Copepoda of New-Zealand. 



^otes from, the Leyden IMuseuiri , Vol. XIX. 



