LIKE A CHAM.ELEON 235 



a three-jointed wrist, not a two-jointed one as in Plati/hema 

 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 Plafybema 

 are six-jointed, and those of Latreutes seven-jointed. 



Caridion contains the British species Garidion Gordoni 

 (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 no exopod. Yet in Hippolifte Gaimardii, 

 Milne-Edwards, which he makes the type -species of 

 Hetairus^ they undoubtedly have an exopod. Further he 

 says that the first and second maxillae of that species are 

 ' unlike those of 8pirontocaris' 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 yoints out that Hippolyte varians. 

 Leach, is the type-species of Hippolyte, and, as Stimpson 

 has placed it in his genus, it shows that Virhius 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 



