458 



down the ooxal plates; ova in the marsupial pouch hlnisli green. Length of 

 adult female 7 mm. 



Rcmarl-i;. — The description given by Boeck of this form, as also the 

 figures reproduced, are rather unsatisfactor3^ and in some points even verj' 

 misleading. Thus lie erroneously describes the body as l)eing compre.ssed, 

 and the superior antennae as much longer than the inferior. Moreover, the 

 last pair of epimeral plates of metasome are said to be acutely produced at 

 the lateral corners, and the posterior edge of the basal joint of the posterior 

 pereiopoda to be serrated. In spite of these apparent disagreements, it is 

 quite certain, that the form above described is that named by Boeck as ab^ve. , 

 The great fragility of the animal, and the consequently more or less imperfect 

 state of the specimens captured, may have been the reason why Boeck could , 

 not make out its description satisfactorily. 



Occurrence. — This peculiar Amphipod is by no means rare. I have j 

 met with it in numerous places off the west coast of Norway, and have also 

 found it in the Trondhjemsfjord, and as far north as Bode, in depths ranging 

 from bO to 150 fathoms. In nearly every case it occurred on rocky bottom, 

 especially where this consisted of coarse gravels and stones, and as the animal 

 is extremely fragile, it may therefore easily be crushed or injured in hauling 

 up and emptying the dredge. On applying very light dredges, I have 

 however, occasionally succeeded in cajtturing it quite uninjured, and have thus 

 had an opportunity of observing the animal in the living state. It is veryi 

 rapid in its movements, but seldom swims about for any length of time, 

 clino-ing very soon with its sharp dactyli to some gravel or stone, where 

 it remains motionless, with the urosome folded in beneath the body, and its long 

 antennee spread out to either side. Seen from above, it exhibits in such case.? 

 a most strange aspect by its very broad body and the laterally extended coxal 

 plates, looking more like an Isopod than an Amphipod. Out of Norway tliis 

 form lias not yet been recorded. 



Gen. 8. LeptamphopUS, G. 0. Sars, n. 

 Syn. : Ampliitliopsis, Boeck (part). 



Body slender and compressed, with none of the segments produced 

 dorsally, and the urosome of normal appearance. Ceplialon rather large and 

 deep, with a very small rostral projection, and the postantennal corners well 

 defined. Coxal plates of moderate size, 4th pair the largest and distinctly 



i 



