A WELL-CONSTRUCTED KEY 175 
Family Galatheide. 
The characters are those of the legion. About ten 
genera are included, two of which—Galathea and Munida— 
belong to the British Fauna, and, according to Dr. Hender- 
son, have many species inhabiting shallow water. With 
the exception of one doubtful genus, the remainder are as 
yet known only from deep water, and it must be said that 
according to Dr. Henderson’s own report, only a few out 
of the species of Munida come from small depths, some 
going down to more than 2,000 fathoms, and the majority 
being taken most abundantly at depths varying from 100 
to 300 fathoms. 
Galathéa, Fabricius, 1793, has the carapace usually 
free from spines, except on the anterior gastric area, but 
furnished with furry transverse strie. The rostrum is 
flattened, rather broad, generally having teeth on the 
margins. ‘The segments of the pleon are unarmed. There 
are numerous species occurring at very varied depths. 
They swim backwards with activity, and Mr. Couch states 
that it is very remarkable to witness the accuracy with which 
they will dart backward for several feet into a hole very 
little larger than themselves, an acrobatic performance 
which he had often seen carried out, and always with pre- 
cision. ‘There are five British species, all of which occur 
also on the coasts of France, where they have been studiea 
and described very carefully by M. Jules Bonnier. He 
supplies a very useful key to discriminate them, depending 
partly on the shape of the third maxillipeds, and partly on 
the presence or absence of an epipod in the limbs of the 
trunk. The epipod, it will be remembered, is the branch 
which issues from the basal joint of an appendage. In 
Galathea squamifera, Leach, Galathea nexa, Embleton, and 
Galathea dispersa, Spence Bate, there are epipods to the 
chelipeds and the two following pairs of limbs ; in Galathea 
intermedia, Lilljeborg, there are epipods to the chelipeds, 
but not to the following pairs of limbs; in Galuthea stri- 
gosa, Fabricius, there are no epipods to any of the three 
