126 bulletin: museum of comparative zoology. 



organisms, and both belong to the warm waters of the North Atlantic, 

 though both are carried to Norwegian waters by the Gulf Stream. 



Physophora was taken at Station 30, on the surface, two speci- 

 mens. Agalma was more generally distributed, being captured at 

 Stations 7, 27, 28, 32, 39, a total of eight very fragmentary speci- 

 mens. Unfortunately, most of them have all the organs stripped off 

 the stem, not a tentillum being intact; and as the latter organs are the 

 chief generic character, identification is not beyond dispute. But the 

 general form of the few bracts which remain attached, and of the bells 

 taken in the same hauls, suggests identity with Agalma elegans rather 

 than with its close ally, Stephanomia. The records are all from the 

 off-shore part of the Gulf. 



Ctenophores. — Two ctenophores were taken and seen frequently, 

 Pleurobrachia pileus and Bolinopsis septentrionalis, neither of which 

 was generally distributed over the Gulf, though both were taken at 

 many localities. 



Pleurobrachia (Plate 6) was found at Stations 23, 27, 29, 30, 31, 32, 

 40, 43: in the Kennebec River and off the Grand Manan Bank: 

 several times, notably at Station 40, in great abundance. That is to 

 say, during July and August it was wholly absent from Massachusetts 

 Bay, and from the coast waters between Cape Ann and Casco Bay; 

 but was of general occurrence in the northeastern part of the Gulf, 

 over German Bank, and the Eastern Basin, as well as off Cape Cod 

 (Station 43). Swarms were encountered at Stations 30, 31, and 40; 

 the salinities and temperatures being: — 



Station 30 surface temperature 52° salinity about 32.7% 



Station 31 surface temperature 56° salinity about 32.8%o 



Station 40 surface temperature 58° salinity about 32% 



The salinity was not taken at Station 40, but is estimated from the 

 records of neighboring stations. At Station 40, the swarm consisted 

 of small individuals; at Stations 30 and 31, of large and small; and 

 it is interesting to observe that the swarm at Station 40 was in water 

 with very little microplankton (p. 133) while a few miles to the east, 

 where there was an abundant microplankton, we found no Pleuro- 

 brachia. 



Bolinopsis infundibulum (Plate 6) was taken (or seen floating on the 

 surface) at Stations 4, 6, 9, 11, 22, 25, 34, and 43, i. e., in Massachusetts 

 Bay, the coastal waters north of Cape Ann, Jeffrey's Bank, the Grand 

 Manan Channel, and off Cape Cod; but it was apparently absent at 

 all the off-shore stations, at Piatt's Bank and on German Bank: nor 



