124 DR. G. STEWARDSON BRADY ON [May 17, 



collection, agreeing down to the minutest details with British 

 specimens. 



EcTOCYCLOPS, nov. gen. 



Like Cyclops except that the mandibles, maxillse, and maxillipeds 

 are less fully developed and are very indistinctly jointed, the 

 posterior antenna bears a very stout ciliated seta on the posterior 

 margin, and the terminal joints of the rami of the swimming-feet 

 are scarcely at all elongated. 



EcTOCYCLOPS RUBESCENS, n. sp. (Plate VI. figs. 19-20; 

 Plate YII. figs. 21-27.) 



Female. Body depressed, rather robust (fig. 19) ; cephalothoracic 

 segments not produced laterally ; abdominal segments short and 

 stout, posterior margin of the last segment pectinated, f ureal 

 segments not much longer than broad ; principal tail-setae 

 marginally aculeated, the innermost nearly equalling three-fourths 

 of the length of the body ; ovisacs large and adpressed. Anten- 

 nules (fig. 20) ten-jointed, much shorter than the first cephalo- 

 thoracic segment, and rather densely setiferous ; antenna; (fig. 21) 

 robust, anterior margin fringed towards the base with numerous 

 short setse, penultimate joint with about six lai^ger setse, terminal 

 joint with several longer setse ; on the posterior margin rising 

 from the base of the second joint is a very long and stout 

 ciliated appendage. Mandibles bearing a rudimentary palp con- 

 sisting of three very small setse ; maxillse (fig. 22) not much 

 difierent from those of Cyclops ; anterior and posterior maxillipeds 

 (figs. 23, 24) small, stout, and indistinctly jointed, the marginal 

 curved teeth of the anterior pair vei-y robust ; rami of the 

 swimming-feet three-jointed (figs. 25, 26), fifth pair obsolete, 

 represented only by three short plumose setse (fig. 27). Colour of 

 the posterior part of the body faint reddish-brown, the anterior 

 part nearly colourless (in spirit specimens). Length 0'85 mm. 



Attheyella natalis, n. sp. (Plate YII. figs. 28-33.) 



Female. In general outline like GantJiocamptus (fig. 28). 

 First thoracic segment coalescent with the head ; postei-ior 

 abdominal segments spinulose on the hinder margin ; fm-ca very 

 short ; principal tail-setse equal to at least half the length of the 

 body. Antennules slender, nine- jointed (fig. 29), shorter than 

 the first cephalothoracic segment, and very sparingly setiferous ; 

 antennse (fig. 30) bearing a minute one-jointed secondary branch. 

 First pair of swimming-feet (fig. 31) short, both branches three- 

 jointed, outer about equal in length to the first two joints of the 

 inner branch ; second, third, and fourth pairs having the outer 

 branch composed of three, the inner of one joint (fig. 32) ; fifth 

 pair (fig. 33) foliaceous, two-jointed, basal joint wide and bearing 

 four long setse on its inner and one on the outer lobe, terminal 

 joint ovate and bearing three unequal apical setse. Length 

 0*75 mm. 



