_ 16 



smooth. Last pair of legs gradually narrowed distally, and only provided 

 with 2 apical setae, inner edge scarcely expanded. 



Male much smaller than female, but exhibiting a very similar slender 

 form of the body. Tail, as usual, composed of 4 well defined segments, the 

 1st of which is the largest, and is produced below to a rather large and 

 prominent copulative appendage of an oblong oval form and armed on each 

 side with a straight rod-like spine. Caudal rami of the very same shape as 

 in the female, and having the outermost but one of the setae reduced in a 

 similar manner, differing, however, as in the males of the preceding species, in 

 the absence of one of the apical setae. Anterior antennae hinged in the usual 

 manner. Last pair of legs reduced to 2 very small knob-like prominences, 

 each tipped with a single slender seta. 



Body (in female) highly transparent and ornamented in some places with 

 pigmentary patches of a light reddish colour. Length of adult female reaching 

 to 3.30 mm.; that of male scarcely exceeding 1.60 mm. 



Remarks. I have been in some doubt, if not the above-described form 

 should be the same as that recorded by Scott under the name of M. anglica 

 Lubbock. Indeed, in the structure of the last pair of legs and the peculiar 

 reduction of the outermost but one of the caudal setae, both these forms seem 

 to agree pretty well. On the other hand, is the general shape of the body, 

 to judge from the figure given by Scott, rather unlike, and another very 

 essential difference is found as regards the number of the caudal setae, which, 

 both according to the description and the figure given by Scott, is stated to 

 be 6 on each ramus in the form observed by him. In any case the specific 

 name anglica cannot be applied either to the present form, or to that observed 

 by Scott, as it seems evident that Lubbock's species is different from both of 

 them. I have retained for the species here treated of the name assigned to 

 it long ago in my notes. 



Occurrence. Some few specimens of this form, among them a single 

 male, were collected, many years ago, at Kval0 on the Nordland coast. 



6. Monstrilla gracilicauda, Giesbrecht. 



(PI. VIII) 



Monstrilla gracilicauda, Giesbrecht. Pelagische Copepoden des Golfes von Nenpel, p. 587, 



PI. 46, figs. 9, 16, 18, 29, 32, 43. 



Specific Characters. Female. Body moderately slender, with the anterior 

 division slightly dilated in the middle. Cephalic segment about occupying half 



