MONTAGU’S CALLIANASSA 183 
Family 2.—Callianasside. 
The carapace is laterally compressed, with rostrum 
minute or absent. The eyes and antenne are as in the 
preceding family. The first pair of trunk-limbs are un- 
equal, perfectly or imperfectly chelate, the third and fourth 
pairs simple, the others variable. The uropods and telson 
are usually broad, without sutures. The branchiz are 
filamentous, with the filaments sometimes compressed. 
Six or seven genera are assigned to this family, of 
which two are British. 
Callianassa, Leach, 1814, was instituted to receive a 
species which Colonel Montagu described in 1805 (and 
published in 1808) under the name Cancer Astacus sub- 
terraneus. He found it at the depth of nearly two feet 
beneath the surface, while digging into a sandbank in the 
estuary of Kingsbridge or Salcombe in South Devon. 
Though it was by no means plentiful, he ascertained that 
the larger arm was not constant to one side, and that the 
extreme disproportion sometimes exhibited by it was not 
invariable. The crustaceous covering of the body he 
describes as ‘very thin and not far remote from mem- 
branaceous.’ The exceedingly narrow attachment between 
the first four joints of the larger cheliped and the follow- 
ing three which form its monstrous termination give to 
this species a very peculiar appearance. The second pair 
of feet are minutely chelate. The second pair of pleopods 
are slender and filamentous, while the following three pairs 
are broad and foliaceous. A. Milne-Edwards in 1870 dis- 
tinguishes seventeen recent species. Czerniavsky in 1884 
points out that the Mediterranean Callianassa laticauda, 
Otto, should be added to the list. 
Callhianassa Stimpsoni, Smith, is a species found on 
the east coast of the United States. This and other deep- 
burrowing crustaceans are more often obtained from the 
stomachs of fishes than by intentional methods of capture. 
Cherimus, Spence Bate, 1888, was instituted chiefly 
