338 M. A. Boeck on the AmpMiioda 



little from the preceding genera, and that it does not possess 

 the characters ascribed to that subfamily. In Pontoporeia the 

 head is not dilated into a hood above the superior antennas. 

 The peduncle of these is thick, although rather elongated, and 

 the llagellum short ; the mandibles are distinctly divided at 

 the apex, and somewhat, although obsoletely, toothed. The 

 inner lamella of the first pair of maxilla is large, and furnished 

 with numerous ciliated hairs ; but this is the case, although in 

 a less degree, in Bathyporeia, and even in some species of 

 Anonyx. The second pair of feet is elongated as in the above- 

 mentioned genera ; in Batliyporeia there is no claw upon them, 

 whilst Anonyx and Pontoporeia possess a small claw ; in Uro- 

 thoe the claws are as strongly developed upon the second as 

 upon the first pair of feet. The third and fourth pairs of feet 

 in Pontojjoreia are not furnished with prehensile organs, any 

 more than in some of the preceding 5 but they are as strong as 

 in these. Lastly, the ovigerous lamellae are quite of the same 

 structure as in the preceding genera. 



Phoxus, Kr. — In this genus the head is developed in front 

 into a hood above the peduncle of the superior antennee, and 

 these originate in front of the inferior antennas ; but this can- 

 not be of so much importance as to justify the formation of a 

 subfamily as Spence Bate supposes ; for Urotlwe rostrafusj 

 Dana, possesses a similar hood, wdiilst the other species want 

 it ,• and in some species of the genus AmpeJisca the superior 

 antennfe originate in front of the lower ones, and in others be- 

 side them. In other respects it agrees closely with the pre- 

 ceding genera. The peduncle of the superior antennas is thick ; 

 the apices of the mandibles, which were divided even in the 

 last genus, are here distinctly toothed. The inner lamella of 

 the first pair of maxillee is only small and furnished with few 

 ciliated sette ; the first two pairs of legs are furnished with 

 prehensile hands j the ovigerous lamellae are as in the pre- 

 ceding genera. 



(Edicerus^ Kr. — Kroyer founded this genus upon the species 

 CE. saginatus from Greenland. He indicates as a generic 

 character that the head runs out in front into a long rostrum, 

 which has a knob in its foremost part, as to Avhich Bruzelius 

 and Sars have shown that it consists of the eyes, which have 

 attained this remarkable position. Further generic characters 

 cited are, that the peduncle of the superior antennas is long, 

 with a scarcely longer flagellum, and without a secondary fla- 

 gellum ; the first two pairs of legs are furnished with strong 

 prehensile hands ; the third and fourth pairs arc long, with a 

 broad claw ; the two next pairs have the first joint but little 

 developed, and the seventh pair are very long. Dana added 



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