266 Transactions of the Society. 



jaws or teeth — there were so few of them that I was afraid each 

 one might be the last, and did not like to destroy one. 



Near Maritzburg this Copeus was much infected with a parasite, 

 although C. spicatus and other Eotifers living in the self-same 

 water were perfectly free from it. Mr. Eousselet tells me that this 

 parasite is well known to him, being the same kind of sporozoon 

 that often infests Synchceta pcctinaia. 



The measurements of C. triangulatus show the following values 

 for the largest specimens : total length, expanded, ^ in. (669 yu,), 

 width 7 J 2 in. (346 /x) ; of contracted animal, length -^ (438 fi), 

 width across the hump 5 ] g in. (369 /i.). 



Copeus pachyurus Gosse. — I have seen this on the coast near 

 home during the years 1901-2. This is the fifth Copeus now found 

 in Natal. With the kind assistance of Mr. A . W. Cooper, of 

 Richmond, I was able to send to Mr. Rousselet in 1904 some 

 specimens of C. spicatus, mentioned in 1901. In 1905, I also 

 sent him two specimens, with auricles fully extended, of what he 

 says are C. ccrberus and C. Ehrenbcrgi, both of which I mentioned 

 in my previous list, 1901. 



Eosplwra digitata Ehrenberg. — In March 1904 I sent to Mr. 

 Rousselet a few specimens of two Eosphoras for identification. One 

 he told me was E. digitata and the other E. clongata. This one, 

 E. digitata, was the most savage and carnivorous Rotifer that I 

 have yet seen, a cannibal of the most degraded stamp. In Feb- 

 ruary 1902 I found one which had four sets of teeth in its stomach. 



The teeth were all of one description, namely of the Philodina 

 type. On March 15, 1904, I saw one that was in a watch-glass, 

 with others of the same species, attack one of the others and hold 

 on with its teeth till, its victim was disabled ; it would not let go 

 even when I tried to separate them with a bristle. 



On the 16th, that is the next day, I have another entry in my 

 diary, " Eosphora digitata is very savage, attacking various things 

 in the water, as worms, infusoria, and its own kin." 



Eosphora elongata Ehrenberg. — This was one of the species sent 

 with the above and identified by Mr. Rousselet as E. clongata. 



Diglcna grandis Ehrenberg. — I mentioned in 1901, in a note 

 at the end of my list, that one specimen of this had been found. 

 Since that time, both in 1903 and 1904 in the warm summer 

 months, I have seen other specimens, but not in quantity. Hudson 

 and Gosse speak of the teeth of these animals as being " bristle- 

 like " and also as being " arranged in double rows." 



A statement like this, coming from such an authority, has 

 caused me to examine several times in various media the trophi of 

 this Diglena. My examination amounts to this : — 



That, viewed under a low power, that statement seems to be 

 correct, but, viewed under a 4 mm. of Zeiss apochromatic, the bristle- 

 like appearance of the teeth vanishes, and so also does the double- 



