- 42 - 



in the female, but third joint not shorter than the second. 

 The copulatory organs (Fig. i3) are characteristic. The 

 spine-shaped process is longer than usual, at least more 

 than half as long as the two other processes ; the terminal 

 process has a thin keel on the postero-exterior side reaching 



from before the middle to rather near the end, and the 

 short terminal part of the process is slender, curved essen- 

 tially forwards and acute ; the proximal process has the 

 same not inconderable breadth from the middle to the end, 

 but this breadth is partly due to a thin keel ; the end varies 

 in shape, having the outer angle rounded or produced in 

 a tooth. 



Northern half af the temperate and boreal Atlantic, 

 and the Arctic Ocean from the Baffin Bay to lat. 124 0 E. 



T. Raschii M. Sars. — To the characters in the key 

 of this tolerably well-known species — hitherto referred 

 to Rhoda or Boreophausia — may be added, that in the 

 male the rostrum is much broader than in the female, 

 forming a long and oblong, flat plate; the second anten- 

 nular joint is in the male somewhat thickened with the 

 upper terminal margin produced in a conspicuous, setife- 

 rous lobe protruding above the base of the next joint, 

 while the third joint is in both sexes a little longer than 

 the second, in the female slender and cylindrical, in the 

 male somewhat thickened at the end. The copulatory 

 organs in general aspect rather similar to those of T. iner- 



Fig. i 3. Ihysano'ëssa longi- 

 caudata Kr. inner and 

 median lobe of left copu- 

 latory organ from behind. 

 p K . spine-shaped process; 

 p-. terminal process ; p' 6 . 

 proximal process; p h . la- 

 teral process. 



