( 337 ) 



NOTES ON THE FAUNA OF THE COUNTRY OF 

 THE CHESS AND GADE. 



By T. E. Lones, M.A., LL.D., B.Sc. 



(Continued from vol. six, p. 4'2o.) 



The next species to be described belongs to the family of 

 Entomostraca called Harpactidcs. In members of this family the 

 body is cylindrical or flat, and there is no marked division between 

 the cephalothorax and the abdomen, such as is seen, e. g., in 

 Cyclops serrulatus. The antennge are short, and the swimming- 

 feet, especially the third and fourth, are unusually long, even the 

 fifth pair of feet being well developed. The structure of the fifth 

 pair of feet in the male differs from that in the female, but in 

 both sexes they are two-jointed, and the first or basal joint is 

 usually broad and plate-like. Further, except in a few species, 

 •each female carries only one egg-sac. 



2. Canthocamptus staphylimis, Jurine. — The chief features of 

 this Copepod may be described in a few words. Its head is large 

 and formed by the fusion of the cephalic and first thoracic 

 somites. The second, third, and fourth segments are approxi- 

 mately equal in length. In the female the abdomen bas four 

 segments, the first being very large and formed by the fusion of 

 the first and second abdominal somites. In the male the abdo- 

 men is composed of five segments. The posterior edges of the 

 segments, in both sexes, are finely toothed. 



Zool. 4ith ser., vol. XX,, September, 1916. dd 



