202 



of rather inferior size. It is probable, that the genus Myicola of Whright 

 is nearly allied to the present genus; but I have had no opportunity of com- 

 paring them closer, as the paper of that author is not accessible to me. Only 

 a single species of the present genus is as yet known to me. 



107. Conchocheres malleolatus, G. O. Sars, n. sp. 



(PI. CXII). 



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

 division dilated in front, but narrowed behind. Cephalon only faintly defined 

 from the trunk, and produced on each side to a very conspicuous hammer- 

 shaped protuberance, frontal part broadly rounded. Epimeral parts of the 

 trunkal segments not at all prominent laterally. Last trunkal segment very 

 small. Tail about equalling in length the trunk, and perfectly cylindrical in 

 form; genital segment not at all dilated, and scarcely longer than the 2 suc- 

 ceeding segments combined; anal segment considerably larger than the pre- 

 ceding one. Caudal rami comparatively slender and narrow, tapered distally 

 and slightly divergent; seta of outer edge small, and attached a little in front 

 of the middle; apical setae much reduced in size, the outermost one somewhat 

 remote from the other 3. Eye wholly absent. Anterior antennae scarcely 

 exceeding half the length of the cephalon, some of the joints less sharply 

 defined, the first 2 much the largest, the others rapidly diminishing in size. 

 Posterior antennae with the basal joint very large and massive, the other 2 

 abruptly much narrower and somewhat unequal in size, the last one being the 

 larger; apical claw with a small denticle at the base. Natatory legs of a rather 

 uniform structure and extended somewhat laterally, rami comparatively slender 

 and nearly equal-sized, spines of the outer one small, 3 of them belonging to 

 the terminal joint. Last pair of legs with the free joint very small, oblong 

 oval in form, and carrying one lateral and 2 apical setae. Ovisacs large, sub- 

 cylindrical in form and distinctly curved inwards. 



Male rather unlike the female and of much smaller size, with the 

 cephalon more distinctly defined from the trunk and of quite normal appear- 

 ance, no trace of the peculiar lateral protuberances present in the female being 

 detected. Trunkal segments with the epimeral plates well defined and rounded 

 at the end. Genital segment gradually widening behind and, as a rule, con- 

 taining 2 well-marked spermatophores. Anterior antennae comparatively larger 

 than in female, with all the joints well defined, and carrying 5 large recurved 



