PSEUDOCALANUS. 45 



1. PSEUDOCALANUS ELONGATUS, Boeck, PL III, figs 1 9. 



Clausia elonyata, Boeck. Oversigt Norges Copep. p. 10 (1864). 

 Calanus Clausii, Brady. Nat. Hist. Trans. Northumberland and 



Durham, vol. i, p. 33, pi. i, figs. 1 



11, 13 (1865). 



Body elongated, ovate, anterior antennas in the 

 female (fig. 2) 25-jointed, the seventh and eighth (or 

 eighth and ninth ?) joints being coalescent, the rest 

 gradually increasing in length and tenuity as they 

 approach the distal extremity : in the male the number 

 of joints is reduced to twenty by the coalescence of 

 several, the seventh, eighth, and sixteenth joints 

 (fig. 3) thus becoming much elongated ; the two or 

 three terminal joints are swollen at the distal extremity 

 and contracted at the base, and in the male some of 

 the other joints are also similarly enlarged ; the outer 

 margin of the antennae is sparingly provided with 

 short hairs. Fifth pair of feet wanting in the female ; 

 in the male (fig. 8) they are long and slender, the left 

 consisting of three cylindrical tapering joints, of which 

 the middle is the longest ; the right of five joints, of 

 which the first three are nearly equal in length, the 

 fourth shorter and the fifth quite minute and claw-like. 

 The first abdominal segment in the female is much the 

 longest and is tumid in front ; in the male it is very 

 short : abdomen 4-jointed in the female, 5-jointed in 

 the male ; the caudal segments very short ; tail setre 

 also short, scarcely equal to half the length of the 



