ECTINOSOMA. 13 



4. ECTINOSOMA ATLANTICUM (Brady and Robertson). PL 



XXXVIII, figs. 1119. 



Microsetella atlantica, B. & R. Ann. and Mag. Nat. Hist., ser. iv, 

 vol. xii, p. 130; pi. ix, figs. 1116 (1873). 



Body -^th of an inch in length (fig. 11), excessively 

 slender, almost linear and much attenuated both 

 behind and in front : tail-segments (fig. 19) very short 

 and divergent. First cephalothoracic segment curvate, 

 much attenuated in front, and equal in length to the 

 five following segments. Anterior antennae (fig. 12) 

 slender, 6-jointed, sparingly setose ; posterior large, 

 3 -jointed, the first joint bearing a long 2- (or 3- ?) 

 jointed secondary branch (fig. 13). First foot-jaw 

 2-jointed, short and stout, provided with several apical 

 setae ; second foot-jaw (fig. 16) 3-jointed, with two 

 or three curved claw-like setae at the apex. First four 

 pairs of feet nearly alike ; long and slender ; branches 

 of nearly equal size (fig. 17). Fifth pair (fig. 18) 

 2-jointed ; internal portion of the basal joint produced 

 nearly as far as the apex of the second joint, and bear- 

 ing three apical setae, one of which is very long ; second 

 joint smaller, and bearing two long setae. The caudal 

 segments have two principal setae (fig. 19), the inner- 

 most of which is very short, the other as long as the 

 entire body of the animal. Colour yellowish. 



Taken in the surface-net by Mr. E. 0. Davison in 

 the open sea as follows : Lat. 53 24' N., long. 15 

 24' W. ; lat. 53 15' N., long. 11 51' W. ; lat. 51 22' 



