256 HISTORY OF BRITISH CRUSTACEA. 



at one time believed these curious parasites to be young 

 soles. 



Bopyrus squillarum, Latr. Shrimp-fixer, — Antennae 

 of the male completely concealed beneath the front of the 

 head. Body of the female somewhat elongated. Colour 

 pale greenish, above glossy; abdominal membranes dark at 

 their edges. 



Common on the carapace of the Shrimp, which is dis- 

 figured by the lodgment of this animal distorting the shell. 

 This tumour forms a secure asylum for the protection of the 

 soft membranous bodies of these parasites. Colonel Mon- 

 tagu remarks that the dissimilarity in the sides of the Bo- 

 jjyrus is occasioned by the unequal pressure they receive 

 from the carapace of the Shrimp ; this growth is therefore 

 not constantly alike, but depends on the side of the carapace 

 tenanted by each individual. 



Bopyrus Hippolytes, Ivroyer. — Antennae of the male 

 projecting in front of the head ; body of the female oval. 



The late Mr. Thompson of Belfast found this on the 

 Hijjjjolj/fe varlans, taken on the coast of Galway. 



