616 Transactions of the Society . 



female, newly hatched, still fixed by its hinder extremity to this 

 oviferous expansion, side by side with an unhatched egg. These eggs 

 not infrequently have sessile Voriicellm parasitic upon them. 



In December 1888, I was fortunate enough to see the male in 

 actual coitus with a female, which had become detached from the 

 general cluster. The two gyrated round each other in circles at a 

 great rate, the male making several ineffectual darts, but finally 

 succeeded in attaching himself in the neighbourhood of the cloaca of 

 the female, who, by the speed with which she swam through the 

 water, appeared to be doing her utmost to shake her paramour off. 

 The male is about 1/200 in. in length, with the characteristic quadri- 

 lateral wreath, and two bright red eyes ; the hinder extremity is 

 furnished with a short pointed foot. The sperm-sac fills nearly the 

 whole of the trunk. 



The cluster is frequently infested with a species of micrococcus, 

 which especially attacks the oviferous expansion and its neighbour- 

 hood. 



