26 



in the usual jumping manner, and has on the whole in its behaviour much the 

 appearance of an ordinary Cyclops. Dr. Scott records a smaller form of this 

 species, which he designates as varietas minor. I have also myself in the inner 

 part of the Christiania Fjord observed such small, though fully adult specimens, 

 but have failed to detect any other differences from the typical form. 



Distribution. British Isles (Brady), coast of France (Canu), Gulf of Naples 

 (Philippi), Black Sea (Czerniawsky), eastern coast of Greenland (Buchholtz), Franz 

 Josef Land (Scott), Polar Islands north of Grinnel Land (2nd Fram Expedition). 



11. Euryte robusta, Giesbrecht. 



(PI. XIII). 

 Euryte robusta, Giesbrecht, Mittheilungen iiber Copepoden, 12 14, p. 58, PI. 4, figs. 1 18. 



Specific Characters. Female. Body comparatively more robust than in 

 the preceding species, with the anterior division more regularly oval in outline. 

 Tail comparatively shorter and broader at the base ; genital segment exhibiting 

 in the middle quite similar dentiform projections to those in E. longicauda. 

 Caudal rami rather shorter than in that species, scarcely exceeding in length the 

 last 2 segments combined, and slightly diverging at the end; apical seta3 more 

 evenly ciliated, Anterior antennae, as in that species, rather slender and composed 

 of 20 joints. Posterior antennae somewhat less robust, with the 2nd joint scarcely 

 angular behind and the apical setae thinner. Posterior maxillipeds with the apical 

 claws more slender and accompanied by 2 thin bristles. Structure of the legs 

 almost exactly as in E, longicauda, though having the spines comparatively shorter 

 and stouter. Ovisacs small and of irregularly rounded form, each containing a 

 very limited number of ova. 



Male resembling that of the preceding species, bat of somewhat more 

 robust form. 



Body of a dark ochraceous colour, the caudal rami being tinged with 

 deep chestnut and the anterior antenna with bands of a similar hue. 



Length of adult female 1.20 1.40 mm., of male about 1.00 mm. 



Remarks. I cannot doubt that the above-described form is identical with 

 that recorded by Dr. Giesbrecht from the gulf of Naples, though there are a few 

 points of disagreement. Thus Dr. Giesbrecht counts 21 joints in the anterior 

 antenna?, whereas I have never found more than 20 such joints, some of which 

 even are imperfectly defined. The figure given by him of the posterior antennae 

 also differs somewhat, and more agrees with those antennae in E. longicauda. 

 Otherwise, however, the two forms seem to agree perfectly. 



