16 6_ 



being more than twice as long as the 2nd, apical claw comparatively short. Na- 

 tatory legs of almost exactly the same structure as in A. pallidus. Last pair of 

 legs also of a very similar shape, though the distal joint is more oblique and 

 the inner expansion of the proximal joint comparatively broader, marginal seta 

 rather short and very distinctly ciliated. Ovisacs unusually small, each contain- 

 ing, as a rule, only 2 ova. 



Male with the inner ramus of the mandibular palp peculiarly transformed, 

 vesicular in shape, with only a single small seta on the inner edge. 2nd basal 

 joint of 1st pair of legs produced inside to an obtuse conical prominence, beyond 

 which is a comb-like series of 5 blunt spines. Inner ramus of 2nd pair of legs 

 transformed in the usual manner. Last pair of legs much smaller than in female, 

 distal joint broader than in the male of A. pallidus, and the end obliquely 

 truncated. 



Colour dark grey. 



Length of adult female 1.20 mm. 



Remarks. This form was erroneously referred by Boeck to the genus 

 Dactylopus. As proved by the double ovisac and the structure of the several 

 appendages, it is however unquestionably a true Amphiascus, nearly related to 

 A. vallidus, though easily distinguished from it by its much larger size and the 

 short and stout anterior antennae, with their coarsely ciliated setae. 



Occurrence. This is a true deep-water species, and thus fully deserves 

 the specific name given to it by Boeck. I have found it occasionally in the upper 

 part of the Christiania Fjord and also in several places on the west coast of 

 Norway, in depths ranging from 40 to 100 fathoms, muddy bottom. It moves 

 with great dexterity through the loose mud, and very seldom leaves the bottom. 



107. Amphiaseus hispidus (Norman). 



(PI. CVII & CVIII). 

 Stenhelia hispida, Brady, Monogr. Brit. Copepoda, p. 32, PI. XLII, figs. 1 14. 



Specific Characters. Female. Body rather slender, cylindric in form, 

 with the integuments strongly chitinised. Cephalic segment narrowly rounded in 

 front, and not very deep; rostrum rather prominent and somewhat curved. Epi- 

 meral plates of the 3 succeeding segments small and rounded behind; last 

 segment scarcely narrower than the preceding one. Urosome nearly as long 

 as the anterior division and having the segments very sharply defined, genital 

 segment distinctly divided in the middle, and, like the 2 succeeding segments, 



