1 8 MR. T. SOUTHWELL ON MIGRATION OTHER THAN OF BIRDS, 
and Distribution of the Herring ” arrived at very similar 
conclusions with regard to that fish.* 
There are many puzzles connected with the terrestrial 
mammalia, such as the occasional flocking together of vast 
numbers of Lemmings and the sudden invasions of Field 
Mice, which are waiting intelligent solution, although their 
bearing on the subject of migration is only indirect ; but 
when we turn to the marine mammalia we find the phenomena 
of migration in operation to their fullest extent. I need only 
briefly refer to the fact of the gathering together of the Eared 
Seals in vast numbers on the islands in Bering Sea, or to the 
still vaster congregations of true Seals on the ice floes in the 
Gulf of St. Lawrence and off the east coast of Newfoundland, 
the object of both being to form shore nurseries for their young, 
but must hasten to speak of the purely aquatic family of 
Cetacea, and I think it may be said that from the giant 
Sperm Whale to the smallest Dolphin, so far as their habits 
have been investigated, they all come under the denomination 
of migrants. But here again there is reason to believe that 
with perhaps the exception of certain Ziphioid Whales, even 
these are not such great wanderers as has generally been 
supposed. 1 1 is the opinion of some that even the Sperm Whales 
of the Tropics are distinct from those, say, frequenting the 
Japanese Seas, and those who deal commercially with their 
products recognise a difference in their qualities ; A it is also 
believed by some that the Sperm Whales which occasionally 
stray to our shores are derived from a race inhabiting the 
North Atlantic. How far this may be the case I am not in 
a position to venture an opinion, but reasoning from analogy 
it is far from impossible. . - J 
One of the most regular marine migrants is the Bottle-nose 
Whale (Hyperoodon), which visits our shores almost every 
springy going ^nor thward, where it congregates in small flocks 
and spends jLe^summer^ in the Greenland Seas, again visiting 
us on its return] southj[inj[autumn,Hhe old females frequently 
accompanied by their single young one, |thejn ales, asjs often 
the case during migration, separating from the females and 
* ‘Transactions’ (1894) vol v. p. 584. 
