The Migration of Fishes. 51 
. 
Cc 
which tends to show that the shad, salmon, and alewife do 
not follow this course, will apply, with modifications, to the 
menhaden. The menhaden schools at different points along 
the coast appear to have individual peculiarities correspond- 
ing to those of the shad in the different rivers. A Maine 
menhaden may be easily distinguished from the Long Island 
menhaden, a Chesapeake or a Florida one by certain dif- 
ferential characters easy to perceive, but difficult to describe. 
The presence of the crustacean parasite in the mouths of the 
Southern menhaden, and its absence from those of the North, 
is a very strong argument in favor of local limitation in the 
range of menhaden schools. That the same school of menha- 
den return year after year to the same feeding-ground is ren- 
dered very probable by the statements elsewhere given in 
detail. The schools in the Southern waters do not receive 
any apparent increment at the time of desertion of the north 
coast, nor are the southern: waters deserted at the time of 
abundance in the North. There is, however, a limited north 
and south migration. The Maine schools, on their departure 
in the fall, appear to follow the southward trend of the coast 
until they strike the hook of Cape Cod, where they are de- 
tained for some days; they then round the Cape and are again 
detained by the hook of Montauk Point. They first strike 
the shore at Point Judith, and are turned over into Peconic 
Bay by the line of islands stretching across the eastern end 
of Long Island Sound. In the same way the Chesapeake 
schools are said to be detained for some days by the projec- 
tion of Cape Henry. 
VII. THE ARGUMENTS FOR AND AGAINST THE THEORY OF SOJOURN 
IN THE WARMER STRATA OF MID-OCEAN. 
The questions of hybernation and extended migration hav- 
ing been considered, it only remains to discuss the third 
