201 



hensile. Oral parts more or less imperfectly developed; the posterior max- 

 illipeds being in female rudimentary or quite absent. Natatory legs in some 

 cases normally developed, in other cases much reduced. Last pair of legs 

 present and extended laterally, being generally uniarticulate. 2 ovisacs present 

 in female, attached laterally. 



Remarks. The type of this family is the genus Clausia of Claparede, 

 the systematic position of which has remained rather questionable, though it 

 evidently ought to be included within the great section of poecilostomous 

 Cyclopoida. Another genus apparently referable to the same family will be 

 treated of in the sequel. 



Gen. 49. Conchocheres, G. O. Sars, n. 



Generic Characters. Body elongated, tapered behind, with the integu- 

 ments very thin and soft. Anterior division divided into the normal number 

 of segments, and not very sharply marked off from the posterior. Cephalon 

 more or less distinctly defined, and in female conspicuously protuberant later- 

 ally, front without any rostral prominence. Tail in both sexes composed of 4 

 segments only. Caudal rami slender, with the apical setae much reduced in 

 size. Anterior antennae composed of 6 joints clothed with comparatively short 

 setae, and in male moreover provided with a number of largely developed 

 aestethasks. Posterior antennae in both sexes short and stout, carrying on the 

 tip a strong uncinate claw. Oral area not far remote from the insertions of 

 the antennae, and but little protuberant. Anterior lip bell-shaped, with a small 

 incision in the middle. Maxillae very small, with the masticatory part narrowly 

 exserted and armed at the tip with 3 hook-like spinules; palp small, lamelli- 

 form. Anterior maxillipeds with the basal part oblong in form, tapering 

 distally, terminal part imperfectly defined and provided with a single small 

 curved spine. Posterior maxillipeds wholly absent in female, but distinctly 

 developed in male and, as usual, prehensile. Natatory legs present in the 

 normal number and all having the rami distinctly 3-articulate. Last pair of 

 legs represented on each side by a small 3-setose joint. 



Remarks. The present genus agrees with the typical one in the com- 

 paratively slender form of the body, and partly also in the structure of the 

 antennae and the oral parts. The natatory legs, however, are rather different, 

 and much more fully developed. On the other hand are the last pair of legs 



