RED SEA AND INDIAN OCEAN COPEPODA. 403 



right angles to the abdomen. It has a wide distribution 

 in the warmer waters of the sea. 



Calocalanus plumosus (Claus). 

 Occurrence, Nos. 4, 5, 6, 7, 8, 9, 16, 18. 



This species is distinguished from C. pavo by its more 

 slender form and three-jointed abdomen. In C. pavo the 

 abdomen is two-jointed. The fifth pair of feet of the 

 female are also different from C. pavo. Its distribution 

 is somewhat similar to the above, but it does not appear to 

 have been previously recorded from the Red Sea and 

 Indian Ocean. 



Clausocalanus furcatus (Brady) . 

 Occurrence, Nos. 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 14, 15, 16, 



17, 18, 19. 

 Closely allied to Clausocalanus arcuicornis (Dana), but 

 easily distinguished from that species by the genital or 

 first abdominal segment being shorter than each of the two 

 following segments, and by the caudal furca being nearly 

 twice as long as broad. It will probably be found to have 

 a wide distribution. 



Euchaeta marina (Prestandrae). 

 Occurrence, Nos. 6, 8, 9, 13, 14, 15, 17, 18. 



This is one of the most widely distributed and usually 

 most abundant members of the genus. 



Scolecithrix dance (Lubbock). 

 Occurrence, Nos. 9, 11, 16, 18. 



This appears to be a widely distributed species, but does 

 not appear to have been recorded from the upper regions 

 of the Indian Ocean. No. 9 gathering was taken about 

 40 r E. of Aden. All the four gatherings were taken 

 during the night. 



Centropages furcatus (Dana). 

 Occurrence, Nos. 2, 3, 6, 8, 9, 16, 18, 19. 



