320 HTSTORY OF BRITISH CRUSTACEA. 



and third thoracic plate-like appendages, marked in the 

 centre with black patches. A variety (P. Boscii) appa- 

 rently of this has the body of a pale colour. 



Hab. Torcross, Devon, on the Mustelus vulgaris and 

 Galens. Mr. Cocks, of Falmouth, took the species from a 

 specimen of the Carcharias glaucus, captured a few miles 

 from Falmouth harbour in 1849. 



Fam. CECROPID.B, Baird. 



Head as in Vandaridce. There is a single plate-like ap- 

 pendage on the dorsal surface of the thorax. The oviferous 

 tubes are concealed under a shield-shaped plate, and twisted 

 in many convolutions. 



The naturalist, I)r. Baird tells us, who went out in the 

 expedition under the command of the "unfortunate La 

 Peyrouse," found a poor diseased sunfish, on the coast to the 

 north-east of Nootka Sound, infested by different species of 

 parasites (the one on the gills was a Cecrops) ; and it is on a 

 species of sunfish [Orthagoriscus mold), occasionally caught 

 on our coasts, that the British Cecrops has been always 

 found. 



