206 THE ZOOLOGIST. 



Fig. 2 shows three specimens from the Potten End Pool, after 

 they had left the Daphnia shown in fig. 3, and still connected 

 by means of a detached portion of the sticky matter. Their 

 bright red eye-spots, like small rubies, were very conspicuous. 



By killing the Daphnia or other host with a dissecting-needle, 

 the Eotifers at once begin to struggle violently to free themselves, 

 and so they do when a little cocaine solution is put on the slide. 

 It may be mentioned here that the various species of Eotifers 

 differ very much in their ability to resist the action of cocaine. 

 Many of them at once contract considerably under its action, 

 but some are affected somewhat slowly. One of these is 

 B. rube?is, for, when trying to induce contraction sufficient to 

 allow its oral spines to be seen clearly, I have found it best to 

 add cocaine solution to the water until the strength is nearly 

 two per cent. 



5. Noteus quadricornis, Ehren. — This well-known Eotifer is 

 to be found more particularly in Parsonage Farm Pool, Abbots 

 Langley, and in the old pool near the side of Chesham Eoad, 

 opposite Ashlyn's Hall, Berkhamsted ; this will be referred to 

 as the Chesham Eoad Pool. 



The specimens of N. quadricornis from these pools were all 

 taken during the months of August and September. The most 

 complete records of the appearance and disappearance of this 

 species refer to the Parsonage Farm Pool ; for instance, many 

 specimens were obtained there on August 11th, 1912, some being 

 very fine specimens indeed ; a few were obtained on September 

 6th, 1912 ; on September 18th, 1912, six empty cases or loricas 

 of the same species were obtained, but no living specimens ; on 

 September 22nd, 1912, I failed to obtain any trace of N. quadri- 

 cornis. Among many collections of the forms of life in this 

 pool, obtained during the ensuing months, I did not obtain a 

 single N. quadricornis until August 18th, 1913. The Chesham 

 Eoad Pool has yielded specimens as late as the very end of 

 September. 



Among the specimens obtained from Parsonage Farm Pool 

 on August 11th, 1912, was a particularly fine one. It was a 

 beautiful object, appearing in side view like a deep purse tobacco- 

 pouch, with two strong spines projecting from its lower edge, 

 and two strap-like projections on tbe upper or dorsal side of the 



