256 BOPYRID. 
itself between the branchial appendages and the carapace, 
and forming a tumour on one side. From this situation 
he extracted it alive, and kept it in sea-water for several 
days. In all the specimens which he discovered the 
female was attended by the minute male, which was con- 
cealed amongst the arborescent appendages of the tail, 
to which it was affixed firmly by its claws. He adds, 
that the very disproportionate size of the sexes is wisely 
adapted to an animal whose habitation is so confined. 
As we are only acquainted with a single British species 
(which is also found on the north-west shores of France), 
it is unnecessary to redescribe the characters of the 
species, which are included in those of the genus 
given above. The colour of the animal is generally 
orange, with the appendages whitish. Our figures are 
copied from the beautiful ones published by M. Milne 
Edwards in the Crochard Edition of Cuvier’s ‘ Régne 
Animal,” that author having been enabled to examine 
recent specimens of both sexes. It was found by Colonel 
Montagu in the Kingsbridge estuary, on the south coast 
of Devonshire. 
The Callianassa on which it lives exists in galleries of 
its own excavation, about a foot beneath the surface of 
the sea bottom. 
Unfortunately, the specimen preserved in the British 
Museum, and to which is attached a label in Montagu’s 
hand-writing, is not an Jone, but a Bopyrus. 
Brebisson (‘ Crust. Departm. Calvados”) states that 
Tone thoracicus “ se trouve sous les pierres baignées par la 
mer;” but we fear that he was misled by Latreille’s 
incorrect reference of Oniscus ceruleatus (Praniza) to the 
Oniscus thoracicus of ‘ Montagus,” in the “ Encyclopédie 
Méthodique.” We cannot reconcile his description of 
the animal with the true Ione. 
