LIKE A CHAMALEON 235 
a three-jointed wrist, not a two-jointed one as in Platybema 
rugosus, Spence Bate. ‘The last-named author appears 
only to have read de Haan’s generic and not his specific 
description. One mark of distinction alone appears to 
stand, namely, that the second maxillipeds of Platybema 
are six-jointed, and those of Latreutes seven-jointed. 
Caridion contains the British species Caridion Gordont 
(Spence Bate). 
Hetairus must, I think, become a synonym of Spiron- 
tocaris. In his synopsis (‘ Challenger Macrura,’ p. 577) 
Bate says that Hetairus has no cutting edge to the man- 
dibles, which is contrary to the fact and to his own state- 
ments on pp. 610 and 612. He says that its third 
maxillipeds differ from those of Hippolyte and Spironto- 
caris in having noexopod. Yet in Hippolyte Gaimardu, 
Milne-Edwards, which he makes the type-species of 
Hetairus, they undoubtedly have an exopod. Further he 
says that the first and second maxille of that species are 
‘unlike those of Spirontocaris.’ This is clearly a slip of 
the pen. Yet it is a pity that reference should be made 
to a figure which is not given to illustrate an unlikeness, 
which does not exist. 
Hippolyte is a genus that has been involved in much 
confusion, and that has been made the recipient of many 
species. Bell, in 1853, was content to assign to it six 
British species, but Adam White, in 1857, augments the 
number to twelve. Some of these have since been trans- 
ferred to the genus Virbius, Stimpson, 1860, but not 
correctly, for Spence Bate points out that Hippolyte varians, 
Leach, is the type-species of Hippolyte, and, as Stimpson 
has placed it in his genus, it shows that Virbius is a 
synonym of Hippolyte. The species is very common in 
tidal pools, and sometimes it has the red hue of the sea- 
weed among which it is found, and at other times it is dark 
green or light green, but the name is appropriate to the 
fact not that the colour is different in different speci- 
mens, but that it varies in the same specimens, so that 
an animal which is red at one time will be green at 
another ; or may possibly go through the whole series of 
