294 THE ZOOLOGIST. 



but not so large as Beryx splendeus (Plate I. fig. 9), or that of 

 Sebastes norvegicus (Plate I. fig. 10). The two former frequent the 

 estuaries of rivers and the coast, the two latter very deep waters, 

 Beryx splendens having been taken at a depth of over four hundred 

 fathoms. Again, in Plate II. we may compare the otoliths of Syno- 

 dontis schal (fig. 3), and that of JElurichthys gronovii (fig. 4), both 

 fishes of the Siluroid family. The contrast in the size of the 



Plate II. — Fig. 1. Lopholatilus chamceleonticeps. 2. Simenchelys 

 parasiticus. 3. Synodontis schal. 4. JElurichthys gronovii. 5. Polypterus 

 senegalus. 6. Lepidosteus osseus. 7. Hydrocyon brevis. 



The above specimens were obtained by the courtesy of the Administration 

 of the National Museum, Washington, U.S.A. (fig. 1) ; H.S.H. the Prince of 

 Monaco (fig. 2) ; Mr. G. Boulenger, F.R.S. (figs. 3, 5, 7) ; Mr. W. Stuart 

 Cameron, of Demerara (fig. 4). 



lapillus is very marked, and does not need the statement of the 

 weights, rather less than a quarter grain for the first against 

 three grains for the second, to emphasize it. The first fish also 

 had a much larger head, and was generally larger than the 

 second. It lived in the Nile ; the second fish came from the sea 

 near Demerara, British Guiana. The above is a remarkable 



