54 



Occurrence. Only some few specimens of this form have hitherto come 

 under my notice. They were taken, some in the upper part of the Christiania 

 Fjord, and some off the west coast of Norway in comparatively shallow water 

 among algae. 



Distribution. British Isles (Brady). 



Gen. 14. TigTiOpUS, Norman, 1868. 



Generic Characters. General form of body resembling that in Harpacticus, 

 though comparatively more attenuated behind. Anterior antennae more robust, in 

 male very strong, subchelate. Posterior antennae with the outer ramus composed 

 of 4 distinctly-defined articulations. Oral parts on the whole resembling in structure 

 those in Harpacticus. First pair of legs, however, with the outer ramus distinctly 

 3-articulate, last joint small but well defined, and armed at the tip with a number 

 of sharply curved claws. Inner ramus of 2nd pair of legs in male with the middle 

 joint produced at the end both outside and inside in a deflexed spine; outer 

 ramus of 3rd pair of exactly the same appearance in the 2 sexes. Last pair of 

 legs of a structure similar to that in Harpacticus, but with the marginal spines 

 very slender, setiform. 



Eemarlcs. This genus, proposed in the year 1868 by Norman, is closely 

 related to Harpacticus, and was not, indeed, accepted by Prof. Brady in his 

 Monograph. Yet it seems to me that the genus ought to be maintained, on ac- 

 count of some well-marked differences to be found in the structural details in both 

 sexes. The genus contains as yet only a single species, to be described below. 



36. TigriopUS fulvUS (Fischer). 



(PI. XXXI & XXXII). 



Harpacticus fulvus, Seb. Fischer, Beitrage zur Kenntniss der EntomostJ-aken. Abh. d. Konig. 

 Bayer. Akad., Vol. VIII, p. 656, PI. I, figs. 3033; PI. II, figs. 3439. 



Syn: Harpacticus chdifer, Lilljeborg (not Miiller). 

 curticornis, Boeck. 



crassicornis, Brady & Robertson. 



Tigriopus Lilljeborgii, Norman. 



Specific Characters. Female. Anterior division of body much broader 

 than the posterior and, seen dorsally, oblong oval in form. Rostrum comparatively 



