30 GERRES. 



of the body in proportion to ist length also is less than 

 in G. nif/ri, in the former the height being contained 3 

 times in the length, in the latter 2\'. only. Adding to this 

 characters the large black spot on the anterior point of the 

 spinous dorsal in G. melanopterus ^ there certainly can be 

 no doubt as to the specific difference of the two species 

 in question. 



Notes from tlie Leyden JMuseum, Vol. "V. 



