AMPHITHOE RUBRTCA.TA. 419 



specimen being a dried one it does not fairly represent 

 the living animal, which has the back somewhat elevated 

 near the middle rather than depressed. The eyes are 

 nearly round, and occupy a position on a lobe between 

 the superior and inferior antennae. The superior antennae 

 are about two-thirds the length of the animal ; the 

 peduncle reaching to the extremity of the penultimate 

 joint of the peduncle of the inferior ; the flagellum is 

 long and slender, represented much too short in the 

 figure, being probably broken in the long-preserved 

 specimen of Montagu. The inferior antennae are one- 

 third shorter than the superior, and the flagellum is 

 scarcely longer than the last joint of the peduncle. 

 The first two pairs of legs are nearly of the same size. 

 The wrists are as broad anteriorly as the hands ; the 

 hands are ovate, having a slightly-defined palm, and the 

 fingers are serrated in the young but scarcely so in the 

 adult specimens, while in the very young there is but a 

 single subapical tooth and several hairs. The next two 

 pairs of legs are short, but have the thighs broad. The 

 fifth pair are very short, but the two last are longer 

 and have the distal extremities not narrowed, and fur- 

 nished with two or three short stiff spines which assist 

 in perfecting the prehensile grasp of the finger when 

 it shuts. The last pair of caudal appendages terminate 

 in a foliaceous plate and well-developed hooks. 



The colour of adult specimens is a brilliant crimson, 

 spotted with several large blotches of white with small 

 spots of black near their margins. By the aid of the 

 microscope the colour is perceived to be due to a close 

 network of stellate pigment covering a corneous ground. 



In the very young animal this corneous tint universally 

 prevails except the few white blotches. When the 

 animal is somewhat grown some small spots of red are 



E E 2 



