PURBLIND CRUSTACEANS. 



Fig. 54- — Parapylocheles scorpio, from the Andaman Sea, 405 fathoms. 

 This Hermit-crab is remarkable in being quite straight and symmetrical. 

 Its eyes are pale and minute, probably as a consequence of living in deep 

 water and burrowing in the mud. 



Fig. 56. — Plasiocrangon cceca, from the Bay of Bengal, 561 fathoms ; 

 a deep-sea shrimp, with pale, dull eyes, which are probably useless for vision. 

 The figure shows the large eggs of this and kindred shrimps ; also the lock- 

 ing-joints of ihe hinder abdomiinal segments, and the bayonet-shaped telson 

 in a posture of defence. 



[ To face pa^e 262. 



