8 BRITISH ENTOMOSTRACA. 



ferior ones were more or less partially decomposed. The 

 marine species are also preyed upon by their different 

 enemies ; amongst which are the Beroes. " The fact of 

 Beroes feeding upon small Crustacea," says Mr. Paterson, 

 " has been recorded by Fabricius, and at present appears 

 to rest upon his authority. It was interesting to observe 

 the fact, which I did without knowing it was previously 

 known. The Crustacea were almost as visible in the trans- 

 parent body of the Beroe as they had previously been, and 

 very conspicuous by the bright green of their colouring."* 

 That the Entomostraca form a considerable portion of 

 the food of fishes has been long observed ; and it is very 

 probable that the quality of some of our fresh-w^ater fishes 

 may in some degree depend upon the abundance of this 

 portion of theii' food. Dr. Parnell informs me that the 

 Lochlevin trout owes its superior sweetness and richness 

 of taste to its food, which consists of small shells and 

 Entomostraca. The colour of the Lochlevin trout, he 

 farther informs me, is redder than the common trout of 

 other localities. AVhen specimens of this fish have been 

 removed from the loch, and conveyed to lakes in other 

 places, the colour remains ; but they very soon lose that 

 peculiar delicacy of flavour which distinguishes so remark- 

 ably the trout of Lochlevin. The experiment has been 

 repeatedly tried, and always with the same results. The 

 ban stickle devours them with great rapidity, and I have 

 seen two or three individuals clear in a single night a 

 large basin swarming with Daphniae and Cyclops, &c. 



* Letter from Mr. Paterson to Mr. TempletoB, in the Memoir on Ano- 

 malocera, in Trans. Ent. Soe., ii, part i, 39. 



