LIFE IN TEFFE. 241 
that family. These specimens furnished a complete embry- 
ological series, some of them having their eggs at the back 
of the gills, between the upper pharyngeals and the bran- 
chial arches, others their young in the mouth in different 
stages of development, up to those a quarter of an inch 
long and able to swim about, full of life and activity, 
when removed from the gills and placed in water. The 
most advanced were always found outside of the gills, 
within the cavity formed by the gill-covers and the wide 
branchiostegal membrane. In examining these fishes Mr. 
Agassiz has found that a special lobe of the brain, similar 
to those of the Triglas, sends large nerves to that part 
of the gills which protects the young ; thus connecting 
the care of the offspring with the organ of intelligence. 
The specimens of this morning seem to invalidate the 
statement of the fishermen, that the young, though often 
found in the mouth of the parent, are not actually de- 
veloped there, but laid and hatched in the sand. The 
series, in these specimens, was too complete to leave any 
doubt that in this species at least the whole process of 
development is begun and completed in the gill-cavity. 
October Ylth. - - Teffe. Yesterday, to our great pleasure, 
our companions, Mr. James and Mr. Talisman, returned 
from their canoe expedition on the rivers Ic,a and 
Hyutahy, bringing most valuable collections. Mr. Agassiz 
has felt some anxiety about their success, as, in con- 
sequence of their small supply of alcohol, for preserving 
specimens, which was, nevertheless, all he could spare 
from the common store, a great deal of judgment in the 
choice of specimens was required in order to make a truly 
characteristic collection. The commission could not have 
been better executed, and the result raises the number 
11 p 
