562 



Prof. R. Burckhartlt on the 



(2) By having their apices blunter than is tlie case with 

 the normally constituted scales, in particular those rows of 

 sciiles which are situated orally with respect to the luminous 

 organs. 



(3) By their base not terminating in a simple rhomboidal 

 edge, but possessing finger-shaped projections which secure 

 for these organs a firmer hold. 



Scale-bases and pigment of the luminous organ of Z. rostraUis. 



In Lcemargus loreah's the luminous organ appears to have 

 arrived at a stage of further reduction because its histological 

 structure is more vestigial still than is the case with that 

 described by Johann. 



Besides this, the scales which surround the luminous organs 

 of this species differ from the normal ones in their stronger 

 pigmentation only and in being more crowded^ but not in 

 variety of form. 



