214 



Miiller ought to be referred to the genus Athelg.es, exhibiting, as it does, all the 

 essential features of that genus. As regards the present species, the shape of 

 the terminal piece of the metasome agrees rather closely with that in the Brazi- 

 lian species, and also the form of the lamella; of the pleopoda seems to be 

 essentially the same. The apparently anomalous structure of the metasome in 

 the male may perhaps be due to the fact that the specimen it not yet fully grown. 



Occurrence. — The above-described specimen was found clinging to the 

 metasome of an Eupagurus cuanensis taken in the Kattegat by Dr. Petersen, and 

 kindly sent to me for examination. The species is accordingly not yet proved to 

 belong to the fauna of Norway; but as Eupagurus cuanensis is not infrequently 

 met with off the south coast of Norway, it is very probable that its parasite 

 will also be found to exist off our coasts. 



Distribution. — Kattegat. (Copenhagen Mus.). 



Gen. 6. PhryXUS, Rathke, 1843. 



Syn.: Bopyrus, Kroyer (not Latr.) 



„ Hemiarthrus, Giard and Bonnier. 



Generic Characters. — Body of adult female very asymmetrical and de- 

 formed, one side (left or right) being greatly swollen and much longer than the 

 other. Cephalon small and deeply sunk within the mesosome. Segments of 

 latter densely crowded together and only visible dorsally, coxal plates very small 

 and only present on the shorter side. Metasome, as in Athelg.es; without any 

 true epimeral plates, and only consisting of 5 segments, the last forming a nar- 

 row terminal piece. Antenna? very small and difficult to observe. Maxillipeds 

 without any terminal joint. Incubatory plates very unequally developed, those 

 on one side alone sufficing to form the large marsupial pouch; 1st pair not pro- 

 jecting in front, being concealed by the next succeeding one. Legs wholly 

 pushed on to the dorsal face, and more or less contorted, those of the larger side 

 all obliterated, with the excepttion of the 1st. Only 4 pairs of pleopoda present, and 

 these rather unequally developed on the two sides, outer lamella larger, foliaceous, and 

 extended laterally, inner lamella small and pushed on to the ventral face. Body of 

 young female less asymmetrical, with all the legs present, though rather irregularly 

 arranged on the one side; that of immature female (immediately after the trans- 



