collected during the Voyage of the ^Ghallenger.'' 187 



deciduous scales, and without phosphorescent organs. Head 

 depressed, with broad, long, spatulate snout, the whole upper 

 surface of which is occupied by a most peculiar organ of 

 vision (or luminosity) , longitudinally divided into two symme- 

 trical halves. Bones of the head Avell ossified. Mouth wide, 

 with the lower jaw projecting ; maxillary dilated behind. 

 Both jaws with narrow bands of villiform teeth j palate 

 toothless. Pectoral and ventral fins well developed, and, 

 owing to the shortness of the trunk, close together. Dorsal 

 fin at a short distance behind the vent ; adipose fin none. 

 Anal fin moderately long. Caudal subtruncated. Pseudo- 

 branchiaj none. 



Ipnops Murrayi. 



B. 12. D. 10. A. 13. V. 8. L. lat. 55. 



Vent nearly twice as distant from the root of the caudal as 

 from the extremity of the snout. 



South Atlantic, 1600-1900 fathoms. 



Gonostoma elongatum. 

 D. 13. A. 29. V. 7. 



The cheek is not entirely covered by the infraorbital. 

 Dentition as in G. denudatum. The height of the body is 

 one seventh of the total length (without caudal) , the length of 

 the head two ninths. 



South of New Guinea, 800 fathoms. 



Gonostoma gracile, 

 D. 10. A. 26. V. 6. 



Apparently scaleless. The cheek is not entirely covered 

 by the infraorbital. The larger teeth in the upper jaw rather 

 numerous. The height of the body is one ninth of the total 

 length, the length of the head one fifth. Tail very slender 

 and narrow. Adipose fin none. 



South of Japan, 345 and 2425 fathoms. 



Gonostoma microdon. 

 D. 13. A. 18-21. 



Cheek naked. Teeth in the upper jaw very fine and 

 numerous, with some larger ones placed at regular intervals. 

 Eyes small. 



Atlantic and Pacific, 500-2900 fathoms. 



[To be continued.] 



