34 



size, and moreover is easily distinguished by the much shorter caudal rami and 

 by the characteristic structure of the last pair of legs. 



Occurrence. Found occasionally, together with E. elongatum, at Selven, 

 Trondhjem Fjord, and also at Tananger, south coast of Norway. 



Distribution, Firth of Forth, Isle of Man (Scott). 



19. Ectinosoma melanieeps, Boeck. 



(PI. XIX, fig. I). 



Ectinosoma melanieeps, Boeck, Oversigt over de ved Norges Kyster iagttagne Copepoder. Chr. 



Vid. Selsk. Forh. 1864, p. 30. 



Syn? Canthocamptus minuticornis, Baird (not Miiller). 



Specific Characters. Female. Body moderately slender, subfusiform in 

 shape, with the cephalic segment, seen dorsally, gradually contracted in front, 

 rostral plate obtusely rounded at the tip. Caudal rami about as long as they 

 are broad, innermost apical seta more elongated than in most other species. 

 Anterior antennae rather slender and attenuated, composed of 7 well-defined 

 articulations. Anterior lip with an angular projection in front. Last pair of legs 

 of moderate size, distal joint comparatively broad and somewhat oblique, with the 

 apical spines slender, setiform and rather unequal, appendicular bristle issuing 

 from the margin between the 2 outermost spines; inner expansion of proximal 

 joint comparatively small, with the inner apical spine quite short and remarkably 

 broad, lanceolate in form, and coarsely serrate on the edges. 



Colour grayish white, with a very conspicuous dark shade occupying the 

 greater part of the cephalic segment. 



Length of adult female 0.65 mm. 



Remarks. It seems to me very probable that the form recorded by Baird 

 as Canthocamptus minuticornis is the present species. As, however, the identification 

 of this form with Cyclops minuticornis of 0. Fr. Mtiller cannot properly be ac- 

 cepted, the species must bear the name proposed for it by Boeck. It is easily 

 recognizable from any of the other species by the dark-coloured cephalic segment, 

 a character which indeed has given rise to the specific name assigned to it by 

 Boeck. The last pair of legs also exhibit several peculiarities in their structure. 



Occurrence. This form is very common along the whole south and west 

 coasts of Norway in comparatively shallow water among alga3, and may be easily 

 detected, in spite of its small size, by the dark-coloured anterior part of the body. 

 As with the other species of the present genus, on touching the surface of the 



