348 BRITISH ENTOMOSTRACA. 



cesses like rudimentary legs, rising from beneath the first 

 joint of the tail." At this time Mr. Salter had not seen 

 a specimen with ova. Shortly afterwards, however, he 

 had an opportunity of examining a female loaded with 

 eggs, upon which he remarks : " Another use, perhaps 

 the especial use, of these two little appendages at the 

 base of the tail seems to be shown ; their position exactly 

 fits them to become a means of supporting and keeping 

 in its place the cluster of eggs. Now with regard to the 

 eggs themselves, the great size of the cluster, and the 

 unyielding nature of the integuments of the animal, seem 

 to be the causes of their external position. I think the 

 cluster consists of two layers, the one continuous, the 

 other with an intermission dow^n the middle, forming a 

 sort of fossa for the tail. You will see from the figure 

 (f. 4 a) that it has a more semi-transparent line down the 

 middle, corresponding in size with the tail, and in the 

 same position. Doubling then the number of a single 

 layer, and subtracting for the intermission (40-|-40 — 10), 

 the number of ova would be about 70. Its abdomen, 

 for such its tail clearly is, is evidently simple, and merely 

 bifurcated at the end. It has a canal, the contents of 

 which had a very singular and regular up-and-down 

 movement, synchronous with what appeared to be a cir- 

 culatory or respiratory movement of the viscera near the 

 head." 



