Plate XXXI. Oceanic fish. 



{Top left) Myctophnni pniictatum. 



{Top right) Argyropelecus hemigymnus. 



{Centre) McViroliciis iiiiilleri. 



(Bottom left) Head of Cliaulodiiis. 



{Bottom right) The wide open mouth of Gonostoma hathyphilum. 



Upper three photographs by James Fraser, 

 lower two by Peter David 



