THE CRAWFISH 195 
The exopod, or ‘ecphysis,’ or ‘palp,’ is present, but as 
de Haan’s figure shows, and as his statement declares, the 
lash-like termination is absent. 3 
It rather looks as if Dana had stolen the type species 
of Scyllarus, on which to found his new genus. At any 
rate he changed Scyllarus arctus into Arctus ursus, both in 
the generic and specific name making allusion to a bear, 
not because of any resemblance in shape between Bruin 
and this crustacean, but evidently because of the thick and 
short pilose substance which protects the tuberculate sur- 
face of the latter, and which is said to give it in its perfect 
condition a smooth velvety appearance, like the shining 
coat of the bear. 
Arctus ursus occasionally makes its appearance in Eng- 
lish waters. It is recorded from many parts of the Medi- 
terranean, and also from Australia and Japan. There are 
several other species of the genus. They do not seem to 
attain any remarkable size. 
Family 2.—Palinuride. 
The carapace is longitudinally subcylindrical, with 
orbits for the eyes partially excavated. The second an- 
tenn are subcylindrical, with a long rigid multiarticulate 
flagellum. 
Spence Bate assigns to this family five genera, one of 
which is found in British waters. 
Palinirus, Fabricius, 1797, is restricted by Spence Bate 
to those species which have asmall central rostriform tooth 
or tubercle that overhangs but does not cover or enclose 
the ocular segment, which have short flagella to the first 
antennz, and in which the segment that carries those 
antenne is anteriorly produced and laterally compressed in 
front. Such species appear to be confined to the northern 
hemisphere. The type, Palinurus vulgaris, Latreille, of 
which the true specific name is involved in some perplexi‘y, 
is found in many parts of Europe, including the shores of 
Great Britain. Bell considers that it is without doubt the 
Carabos of Aristotle. It is a very handsome species, some- 
