1036 Marvels of the Universe 
to be seen in the gardens of the Zoological Society of London. But it is quite commonly used 
for the fish illustrated on page 1038, which is also known as the Dawson River Salmon. Inasmuch 
as there is a general superficial likeness between the two, the mistake can be understood. But 
the Dawson Salmon belongs to the typical “‘ bony”’ fishes, and is known to the expert under 
the name Osteoglossum leichardtt. 
As a food-fish it is excellent, and it has the further advantage of attaining a con- 
siderable size. But it has a still further interest, and this because of the fact that another 
species of the genus also occurs in Australia, one in Sumatra and Borneo, and one in 
South America. 
Since all are river-fish, this distribution is somewhat remarkable. Another near relation 
THE SKULL OF THE CERATOSAUR. 
Note the thick bony ridges over the eye-sockets and the bony core of the horn standing in the middle line behind 
the nostrils. 
of the Australian Osteoglossum is the African Heterotis, a fish remarkable for its curious 
nest-building abilities, and the fact that its air-bladder is cellular and probably used as 
a lung. 
During the breeding season the Heterotis constructs a large nest in a swamp, about two 
feet under the surface of the water. The young are as singular as their parents, since, for a 
time, they breathe by long, slender, filament-like gills which project in tufts from each side of 
the head. 
The Ceratodus, the true Barramunda, is, as we have remarked, one of the lung-fishes, with 
relations in Africa—the Protopterus, and in South America—the Lepidosiren. A glance, however, 
at the form of the fins and the shape of the tail would at once reveal the difference between the true 
Barramunda and the fish which has been erroneously so-called—that is, the one whose portrait 
we have inserted as illustration to this description. 
