44 R. NORRIS WOLFENDEN. 



anterior antcnnie nino-jointed, tlie oxopodite of tlio posterior antenna; like 11. clwlifer, 

 but smaller, the second liasal of the mandihle like II. brivicornis ( = //. fulvus), and the 

 cxopodite scarcely half as long as the endopodite ; both rami of the maxillte are about 

 equal ; the first lobe of the antericn- foot jaws has tliree l)ristles, the fourth lobe is lontj, 

 and its hook short, the posterior foot jaw is much thinner and weaker than in //. clwlifer 

 and //. brevicorniK and more like II. jUwrns. The first feet ha\'e thm and weak tenninal 

 claws, both rami of only two segments, and the endopodite is short, the joints of l)oth 

 branches being broader than in flexua ; the endopodites of the second and f<jurth feet 

 are larger in proportion to the exopodites than in clielifer and hj^evicornis, and in the 

 fourth pair reach to the middle of the last joint of the exopodite ; the bristles on 

 the second endopodite joint are, however, two, instead of one as in clielifer ; the last 

 joint of the fifth feet is comparatively small, and is scarcely half so broad as this ; 

 its last joiut has five, the process of the basal joint, four bristles. 



The striking feature of H. furcifer is the length of the furcal segments, which are 

 usually very short in this genus, and though related to IT. flexus, it difi'ers in the size, 

 which, in the latter species, is only '64 mm. in length, compared with 1'5 in 

 H. furcifer. 



