336 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Gulf is Limacina balea. In 1912 the range of this species was limited 
to two circumscribed areas, 2. e., the northwest corner of the Gulf off 
Casco Bay, and German Bank. But in 1913 it was much more gen- 
erally distributed over the Gulf. In 1912 it was most abundant off 
Cape Elizabeth (1914a), in 1913, off the mouth of Penobscot Bay. 
Clione limacina, on the other hand, was more frequently represented 
in our hauls in 1912 (nine stations) than in 1913 (two stations). But 
as the total number of specimens taken in the former year was only 
sixteen, it is doubtful whether the apparent difference has any special 
faunal significance. And this is likewise true of the one record of 
Diacria trispinosa off Gloucester in 1913. In neither year did we find 
any of the typical warm water pteropods in the Gulf. 
Salpae are especially important because they give certain. evidence 
of the entrance of Gulf Stream water into the Gulf. In both years 
Salpae were found on the eastern side of the Gulf; but while in 1912 
they occurred on the surface over a considerable area (Station 10030 
to Station 10031), in 1913 Salpa was taken in only one haul (Station 
10096). In 1912 the species concerned was fusiformis, while demo- 
cratica swarmed on the surface off Chatham in September (1914a). 
But in 1913 the single catch was tilesit. 
The Sagitta fauna of the Gulf of 1913 was decidedly different from 
that of 1912, for while S. elegans was generally distributed over the 
whole area in both summers, S. serratodentata was far less numerous, 
and occurred at fewer localities in 1913. On the other hand Hukro- 
henia hamata was decidedly more abundant in 1913 (five stations) than 
1912 (one station). 
In 1912 at least one warm water siphonophore was taken in the Gulf, 
Physophora hydrostatica (one station), and probably a second, Agalma 
elegans (six stations) though the specimens of the latter were so frag- 
mentary that identification was not so satisfactory as could be wished. 
In 1913 neither of these was found in the Gulf, though both were 
encountered south of Cape Cod, Agalma in abundance (p. 269). On 
the other hand Stephanomia cara, which appeared in numbers off Cape 
Ann during the winter (1914b) was occasionally represented in our 
tows in the Gulf in 1913 (three stations), though always in a very 
fragmentary condition (p. 315). 
The neritic Medusa fauna of the Gulf was practically the same for 
the two years. But the only oceanic Medusa found there in either 
summer, Aglantha digitale, was much more generally distributed 
and locally more abundant in 1913 than in 1912. 
These facts can be summed up as follows:— 
The list is practically the same in 1913 as in 1912, hence it is evident 
