216 GAMMARTD^. 



lique. In the second pair the hand is much larger, but 

 of nearly the same form, witli the palm very oblique, 

 and defined by two small spines. The third and fourth 

 pairs of walking legs are alike, and have the posteT'ior 

 distal extremity of the hand strongly serrated, as have 

 likewise the three posterior pairs, but being reversed, 

 the serration is upon the anterior distal extremity. The 

 last pair of caudal appendages have the branches of the 

 same length, and reach a little beyond the preceding. 

 The central tail-piece appears more like a small seg- 

 ment of the animal than is usual ; it is cylindrical, and 

 surmounted by a small spinule. 



This species was taken by Professor Milne-Edwards, 

 off the island of Chausay, and named by him in honour 

 of Colonel Montagu, the pioneer of British marine 

 zoology. We have procured it from some refuse brought 

 by the trawlers from the neighbourhood of the Eddy- 

 stone. All our specimens were taken from the back 

 and branchial chambers of Main squinado ; they seemed, 

 indeed, to exist among the thick stiff fur on the carapace 

 of this spider-crab as if they were in their accustomed 

 habitat, their prehensile legs being peculiarly adapted for 

 holding' themselves on that animal. 



