1915] ICHTHYOLOGICAL NOTES paar 
itself. The notochord is relatively rather small, and at this period is 
entirely vacuolated. 
The nervous system is well developed. In the brain the cerebral 
hemispheres are almost distinct; the optic lobes are large, with the 
cavity separating as it passes backward; the epiphysis and the pineal 
body show up well; the hypophysis and the saccus vasculosus are rela- 
tively of large size, and the cranial nerves show distinctly. Judging 
from their appearance, the sense organs must be almost as well suited 
for action as they are in the adult. The nasal pits are quite deep and 
possess a large sensory surface, the eye has the structural characteristics 
and the nerve supply of the adult, while the ear is relatively of large 
size, and is extensively chambered with the ampullze showing distinctly. 
Although much of the yolk—there is an oil globule present—remains 
unabsorbed, the digestive system is apparently of high enough develop- 
ment to look after food taken directly from the sea. At any rate in 
certain other fishes there is not so high a development when the yolk 
is all absorbed. The mouth is of large size, with the posterior portion 
of the cavity in direct connection with the outside through the large 
gill-clefts. The digestive tube does not vary much in size throughout, 
but it is bent on itself to form a loop of considerable length. The anal 
opening is quite far forward, a short distance posterior to the yolk-sac. 
The lobed liver is of large size with well developed hepatic tissue. The 
pancreas shows up distinctly. 
The excretory organs must be strongly functional, as the kidneys 
have got much beyond the single tubule stage and the ducts are rela- 
tively of large size. 
In the circulatory system, the heart has become quite muscular, 
with the chambers and general shape much the same as in the adult. 
The aorta with its branches through the gill arches can be traced easily, 
and many other of the large arteries and veins have become distinct. 
Taking it as a whole the young Ophiodon, as it emerges from the egg, 
is in good condition to look after itself, although, as in the majority of 
young fishes, it will have enemies in plenty, enough to require the use 
of all its powers, no matter how fully they are developed. 
Il. ONCORHYNCHUS KETA WALBAUM: 
“Doc SALMON” 
Plate X, figs. 26-29 
Cne of the characteristic sights in the shallow waters of Departure 
Bay near the Biological Station, during the spring months, is the con- 
tinuous bubbling of the water due to the presence of myriads of young 
