STALK-EYED CRUSTACEA 25 



B. Rostrum two-spined ; spines diverging, 

 b. Rostrum about as long as broad : — 



4. Arachnopsis. 



Araclinopsis . Stimpson, A. Milne Edwards. 



Carapace oblong, narrow, and somewhat truncated in 

 front. Rostrum short, the space dividing the horns 

 being only a notch ; in the centre of this notch appears 

 a small spine from the ridge on the interantennular 

 partition. Orbital arch high, protuberant. Postocular 

 spine long, and separated from* the orbit by a deep, 

 narrow fissure. Eye long, considerably overreaching 

 the tip of the postocular spine, but capable of being 

 drawn back beneath it. Basal antennal joint, with a 

 small, sharp spine at its extremity, pointing obliquely 

 forwards and outwards, between which and the rostrum 

 the flagella are exposed, and with a crest on its under 

 surface extending backwards. Fourth joint of external 

 maxillipedes broader than long, with the antero-external 

 angle rounded but prominent. Walking legs long, fili- 

 form ; the second pair the longest ; last joint straight, 

 acute, and nearly as long as the next joint. 

 Range. — Western Atlantic ; in deep water. 



I. Arachnopsis filipes. 



AracJinopsis filipes . Stimpson, A. Milne Edwards. 



The carapace has two fine spines, one on the gastric 

 the other on the cardiac region. There is a third smaller 

 spine, placed also in the middle line, on the first segment 

 of the abdomen. The hepatic regions are well developed, 

 and have small spines. The branchial regions have hairy 



