History of British Entomostraca . 329 



second terminated by five setae, the three internal being longest, and 

 having a joint near the middle of their length. The mandibles appear 

 to resemble very much 'those of minutus, the teeth, however, being 

 more distinctly seen ; and the barbillons of lips are also very like 

 those of preceding species ; but, from the rigidity of the parts in the 

 specimens from which my figures were taken, I could not sketch 

 these minute organs properly. Hands (Fig. 18) of three articula- 

 tions ; the first one long ; the second short, thick, and curved ; the 

 third being a strong curved hook, the two latter together having the 

 appearance of a very strong claw. First pair of feet (Fig. 19) con- 

 sist of two unequal stalks arising from a common base ; superior 

 stalk (a) the longer of the two, composed of two nearly equal stalks 

 serrated on upper edge ; the second terminating in three short hooks ; 

 the inferior stalk (6) also of two articulations, the first of which is 

 much the longer of the two, and serrated, the second being very short, 

 and terminating in two curved hooks. The three other pairs of 

 feet (Fig. 15 and 20) consist, each stalk, of three articulations, fur- 

 nished with long hairs, one or two of the long terminating ones be- 

 ing finely serrate ; external stalk (a,) as in minutus, larger and 

 longer than internal ; all three pairs of feet resemble each other. 

 Supports or fulcra (Fig. 21 ) consist, each, of a broad fiat body, round- 

 ed at one side, and furnished with several pretty long finely serrat- 

 ed setae ; the opposite side giving off an appendage or finger, also 

 provided with several serrated setae. This species I have named 

 chelifer ; but it differs from the figure and description of Muller's 

 chelifer in so many points, that in a paper upon the Berwickshire 

 Entomostraca, read before the Berwickshire Naturalists' Club, and 

 since that, published in their Transactions, I made a distinct species 

 of it, and named it Cyclops Johnstoni. Upon more minute exami- 

 nation, however, I have again changed its name, restoring to it that 

 of Muller, as it approaches, notwithstanding its discrepancies, suf- 

 ficiently near that species of his, to be identified with it. In Mul- 

 ler's species, he says there are no articulations to the body, which 

 he describes as " farciminis facie," and there are only three articu- 

 lations to the antennae. These characters are so much at variance 

 with the analogous portions of the body in all the other species, 

 that, as he mentions it as a rare species, it is most probable Muller 

 must have made some mistake with regard to them. Some differ- 

 ences also exist in the first pair of feet, and the length of the caudal 

 setae — but they agree so well in the very characteristic hands, in 

 the beaked head, &c, that I have now no hesitation in referring my 

 species to Muller's chelifer. 



