420 THE ZOOLOGIST. 



number of records of forms of life taken from the various 

 localities during November of the years 1912 and 1913 is six, 

 and not a single ova-bearing female is mentioned in these 

 records. The number of collections made in November is quite 

 small compared with those of other months, and probably a few 

 ova-bearing females could be obtained, in the early part of the 

 month, in some of the pools. However, it seems to be a fair 

 conclusion that, for ova-bearing females, November is the 

 poorest month of the year. December also has given poor 

 results, except towards the end of the month, while January has 

 always yielded a large percentage of ova-bearing females, e.g. on 

 January 27th, 1914, there was a large number of C. serrulatus 

 in the small pool at Whelpley Hill, and many of these carried 

 ovisacs, and on January 8th, 1913, eight ova-bearing females 

 were obtained from a small water sample from the pound near 

 the Gade at The Noake, and seven from a small water sample 

 taken from Frithesden Pool on the same date. 



The results for February have not been better than those 

 for January. The records for March and, in a less degree, for 

 April show a larger percentage of ova-bearing females than the 

 records for May, which has given comparatively poor yields, 

 although special mention should be made of a collection from 

 Coxpond, on May 24th, 1915, when many such females were 

 obtained. For the month of March there are two records of the 

 occurrence of very large numbers of ova-bearing females. One 

 of these collections was furnished by the Chess at The Moor, 

 Chesham, on May 11th, 1913 ; the specimens were taken in a 

 square collecting dish, which was scraped along the boards pro- 

 tecting the sides of the river. These boards are covered by a 

 rather thick layer of Confervcs and other small aquatic plants, 

 which arrest a lot of fine mud and afford cover to the Copepods. 

 The other collection was obtained from Langleybury Pool on 

 March 26th, 1914. Among the April records reference is made 

 to only one very large collection of ova-bearing females, viz. one 

 from Wigginton Pool on April 28th, 1913. 



The records for the months June-October show very differ- 

 ent results from year to year. Some comments on the liability 

 of many of the pools to be dried up, entirely or to a large extent, 

 have already been made when dealing with the Eotifera. This 



