'^^^^^^B 



The Journal 



OF THE 



Postal Microscopical Society ^ 



JUNE, 1882. 



®n a 6uppo6eJ) 1Rew Species of Caligue* 



By the Rev. E. T. Stubbs, M.A. 



L^ifc^j) Plate 6. 



AST August there were given to me by the 

 kind and intelligent Manager of the Brighton 

 Aquarium, several living specimens of a parasite 

 which he had found upon a Bass in one of the 

 tanks, and which appear to me to have been 

 hitherto unknown, or at least undescribed. I 

 found afterwards a large number of the same 

 parasite upon a John Dory, in the same aquarium, 

 and thus had a good opportunity of studying 

 closely and minutely their structure. 



There is a group of Entomostraca, chiefly, if not altogether, 

 marine, of the order Siphonostomata, called so, as the name 

 implies, from the shape of the mouth ; the genus Caligidce belongs 

 to this order, and includes, according to Baird, four sub-genera, — 

 Caligus, Trebius, Chalimus, and Lepeoptheirus. 



The mouth in this order is extremely singular in its arrange- 

 ment and appendages, and in the subjoined plate (Figs, i and 2) 

 is seen situated, both in the male and female, on the under side 

 of the cephalothorax, between the first or anterior pair of feet ; 



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