336 bulletin: museum of comparative zoology. 



Gulf is Limacina balea. In 1912 the range of this species was limited 

 to two circumscribed areas, i. 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 tilesii. 



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 Eukro- 

 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 



