106 On the Worm which infests the Stickleback. . (Fer. 
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ARTICLE V. 
Account of the Worm with which the Stickleback is infested. 
By Thomas Lauder Dick, Esq. With a Figure. 
(To Dr, Thomson.) 
SIR, Relugas, near Forres, N. B, Nov. 17, 1815. 
GMELIN, in his description of the gasterosteus aculeatus, or three 
spined stickleback (Syst. Nat. p. 1323), says of that fish “ vermibus 
intestinalibus tanto crebrius infestatus.” And Mr. Donovan, in 
his splendid work on British fishes also remarks with regard to this 
gasterosteus that ‘* Frisch, Pallas, and M. Fabricius, who have 
entered into their history, observe that it is greatly tormented with 
worms at certain seasons, a_fact sufficiently obvious to every common 
olserver.” Although this circumstance in the natural history of 
these fishes appears thus to be already generally well understood, 
yet the following particulars, which I now presume to offer you, 
may not perhaps be altogether unacceptable. 
Early in the month of June last my neighbour and friend Mr, 
Brodie, of Brodie (a Gentleman well known as a naturalist), had 
about 50 or GO of the three spined sticklebacks brought to him 
alive in a vessel of water from one of his ponds. Most of these 
little fish presented the ordinary appearance ; but many of them 
were of a form so very singular as to induce me almost to hesitate 
in pronouncing, at first sight, whether they were the same animal 
er not. Supposing the head and shoulders to have been removed, 
