212 BULLETIN OF THE 
regions really are.* It can hardly be supposed that different physical 
conditions and environment, as far as'the coast line itself is concerned, 
could have brought about such a great difference and such a restriction 
in these floating pelagic animals. The.great influence in their limitation 
must be the temperature of the water, and its difference in the two 
localities. 
As strictly related to this line of inquiry is a suggestion in regard to 
the possible medusan fauna of a region contiguous to the Bay of Fundy. 
It is a well-known fact that the southern part of the Gulf of St. Law- 
rence, near Prince Edward’s Island, presents us an assemblage of south- 
ern genera of Mollusca, surrounded by strictly boreal forms. It would 
be very interesting to discover what the character of the hydroid and 
medusan life of this warm area is, and to see if we have, as in the case 
of the Mollusca, a colony of southern genera protected in their northern 
home by the higher temperature of the water. I have been unable to 
visit this locality for study, but I commend the problem to those who 
engage in marine work on this coast. Unfortunately we know next 
to nothing of the acalephian fauna of this region of the Gulf of St. 
Lawrence. 
CTENOPHORA. 
Mertensia ovum, Morcu. 
The common tentaculated Ctenophore at Grand Manan resembles M. ovum. 
It is not rare near Eastport, where I found it in the summer of 1885 in con- 
siderable numbers. It was taken in some abundance at Grand Menan in 
1886.t 
* Tabular lists of medusw from the Bay of Fundy region and from that of 
Narragansett Bay are given by A. Agassiz in the “ North American Acalephe.” 
The well-marked contrast which one can easily see in these lists appears even 
more striking when we add to those of the Bay of Fundy some of the charac- 
teristic boreal genera here mentioned. 
+ Ova of a Ctenophore were found in great abundance at Grand Manan in July 
and August, 1886. These were traced into young Mertensiz, and are possibly of 
this species. They look unlike the eggs of Pleurobrachia found at Newport. The 
fact that Pleurobrachia rhododactyla, recorded by other observers from, Eastport, 
was not seen by me does not mean that it is not thought to exist there. I have 
only spoken of jelly-fishes observed, and do not wish this paper to be regarded as 
a list of medusz which live in the Bay of Fundy. 
