ENTOMOSTEACA. 209 



the poor fish, from which it cannot be extricated without 

 tearing the neck off, the two side hooks taking so firm a 

 hold in the flesh. In Sowerbv^s ' Miscellany ' is a figure of 

 an unfortunate sprat so ornamented, looking as if some 

 submarine bull-fighter had baited him with harpoons and 

 gay streamers. A curious mistake was committed by De 

 Blainville in reference to this plate. Seeing the body and 

 posterior appendages drawn as attached to the fish, with the 

 head invisible, and then a separate figure of the head and 

 neck as taken out of its burrow, that author copied the 

 figures and described them as two distinct species. 



The only opportunity I have had of observing a living 

 specimen of the Eutomostracous division of Crustacea, was 

 that afforded me by the attendant at the Zoological Society's 

 rish -house, who had just taken from a pike a specimen of 

 Argtdus foliaceiis, which is in the habit of infesting many 

 kinds of fresh- water fisli, such as carp, trout, stickleback, and 

 pike. It is about the tenth of an inch in diameter, — a very 

 interesting object for the microscope. It is of a rounded 

 oval shape, and looks like a broad shield, within which the 

 body, eyes, legs, and mouth appear, leaving outside the 

 margin, only the tail and hind pair of legs. One pair of 

 (so-called) legs is converted into a pair of flexible cylinders, 



p 



