24 



thinner seta; terminal part composed of only a single joint armed with short 

 curved spines. Posterior inaxillipeds of a somewhat unusual appearance and 

 apparently sub-prehensile, the terminal part being abruptly bent and terminating 

 in 2 short claw-like spines. Natatory legs powerfully developed with broad flattened 

 basal part and the joints of the rami partly conspicuously expanded; spines of 

 outer ramus lanceolate, bordered by broad hyaline rims finely serrated at the 

 edges; several of the setse, both of this and the inner ramus, transformed to 

 similar, though more delicate spines. Last pair of legs less rudimentary than 

 usual, and resembling in structure those in the genus Cydopinella. 



Remarks. This genus was established by Philippi as early as in the 

 year 1843, but was not recognised by Boeck, who records it under another name, 

 viz., Thorellia. The genus is especially characterised by the peculiar structure 

 of the maxillary palp and that of the posterior maxillipeds, as also by the trans- 

 formation of several of the natatory setse on the legs to lanceolate spines. Two 

 species of this genus have hitherto been described, both occurring off the Nor- 

 wegian coast, and a 3rd new species is here added. All 3 species are exclusively 

 marine. 



10. Euryte longieauda, Philippi. 



(PI. XII). 



Euri/tc longicauda, Philippi, Fernere Beobachtungen iiber die Copepoden des Mittelmeeres. Arch. 



f. Naturg. 1843, p. 63, PI. 3, fig. ad. 



Sjn : Thorellia brunnea, Boeck. 



Cyclops, nigricauda, Norman. 

 Cyclopina Clausi, Czerniawsky. 



Specific Characters. Female. Anterior division of body rounded oval in 

 outline, greatest width almost equalling 2 /s of the length, and occurring somewhat 

 behind the middle. Cephalic segment very large, considerably longer than all 

 the free trunk-segments combined, and evenly rounded in front. Last trunk- 

 segment somewhat produced on each side. Tail very slender, almost attaining 

 the length of the anterior division ; genital segment imperfectly subdivided in the 

 middle, and exhibiting on each side a dentiform posteriorly-pointing projection; 

 anal segment longer than the preceding one. Caudal rami very slender and 

 elongated, equalling in length the last 3 segments combined, and sublinear in 

 form, diverging a little in their distal parts, which appear slightly thickened; 

 seta of outer edge attached near the extremity ; apical setse not much elongated, 

 the inner medial one not nearly attaining the length of the tail, that of the outer 

 corner shorter than that of the inner. Anterior antennse rather slender, though 



