344 



THE ZOOLOGIST. 



shortest. The posterior edges of the first, second, and thir 

 abdominal segments are notched or serrated, and the posterior 

 edge of the last segment is ciliated. The ovisacs are divergent 

 elongated, and well packed with eggs, forty or more being visible 

 at one view. 



Fig. 32 shows the form of the fifth pair of feet, drawn from a 

 gigas specimen taken from Parsonage Farm Pool. The form 

 of the fifth is practically identical in all specimens of the 

 species and its variety gigas. The first joint of the foot is very 

 short and broad, and its outer part carries a long, curved seta ; 



Fig. 33. 



Fig. 34 



Fig. 32. 



the second joint is small and carries a short spur, and a long, 

 nearly straight seta. 



Fig. 33 shows the form of the receptaculum seminis. The 

 specimen from which it was drawn was from Langleybury Pool, 

 and the drawing was made after the specimen had been narco- 

 tised. The receptaculum, especially its upper section, was some- 

 what contracted, but the figure shows its form very well. 



Specimens of C. viridis have been obtained chiefly in the 

 months of April, May, August, and November, and have been 

 most numerous in the two months first mentioned. Chipperfield 

 Common Pool and Langleybury Pool are very good localities for 

 the normal form of the species. Special reference will be made 



