of the ' southern cross ' expedition. 41 



Gammaridea. 



Fam. LTSIANASSIDiE.* 



This appears to be by far the most im])ortaiit fainily of 

 Ampbipoda in the Antarctic, as it probably is also in the Arctic 

 Seas. The number both of species and specimens much exceeds 

 those of any other family, and most of them are remarkable for 

 their great size as compared with their nearest allies from 

 warmer waters. 



Grenus CHEiRiMEDOisr, Stehhing, 1888, 

 Chall. Amph. p. 638. 



Except as to the posterior angle of the 3rd segment of the 

 metasome, which is not upturned in the following species nor in 

 C. latimanus, G. 0. Sars. 



C. Fougn-eri, n. sp. (PI. 7. figs. 1-6.) 



Lat. 78° 35' S. ; surface, Peb. 15, 1900. Many specimens. 



Body somewhat compressed. Mesosome segments subequal, 

 those of the metasome about half as long again, also subequal, 

 the 3rd having the hind margin nearly straight, forming 

 approximately a right angle with the lower margin. First four 

 side-plates about as deep as the segments. 



TJrosome with a deep dorsal depression in the 1st segment. 



Head as long as the 1st segment; lateral angle rounded; eyes 

 irregularly reniform, wider below, dark iu spirit. 



Upper antennae as long as the head and next four segments t, 

 the 1st joint of the peduncle about twice as long as wide and as 

 the next two joints ; flagellum 27-joiated, the 1st longer than 

 the next three; accessory appendage 6-joiated, the 1st as long 

 as the next four, the last minute. 



Lower antennae about one-fourth longer than the upper, the 

 joints of the peduncle increasing iu length distally, rather densely 

 fringed on the lower margin with short setae. 



* For the definitions of the genera of this family, see G-. 0. Sars, ' Amphipocla 

 of Norway.' 



t The word " united " after " segments" or "joints" must always be under- 

 stood. Also, in all cases, by " 1st joint " of the antennal peduncle is meant 

 the 1st exposed joint or the antepenultimate. The " Ist joint " of a limb is the 

 hasipodite. 



