124 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
with in Massachusetts Bay, at the off-shore Stations (27, 28), in the 
Eastern Basin nor on German Bank (Stations 29, 30). Its absence 
off shore is not surprising, because it is undoubtedly neritic; but its 
absence from Massachusetts Bay is less easily explained, because it 
is often very abundant there in May and June. ‘Phe known salinity 
at which it was taken ranges from 32.5%p to 32.7%o, the known temper- 
ature from 50°-64°, all being surface records. But most of the actual 
specimens taken came from intermediate hauls with open nets; and 
this was notably so at Stations 14, 15, 19, 25, 36, 41, and 43, where 
none were taken or seen on the surface. And the Staurophorae seen 
floating were usually from 4 to 2 fathoms down, seldom on the actual 
surface as Aurelia so often is. None were taken in closing nets. Our 
records do not suggest that Staurophora is restricted to cold waters; 
but probably the young stages are more sensitive to temperature. 
Aurelia and Cyanea (Plate 6) can be considered together, as the 
Gulf of Maine, unlike the Norwegian Sea, has only one species, or 
variety, of Cyanea, which is not a migrant from elsewhere, but a per- 
manent inhabitant, breeding and going through its young stages here. 
As might have been expected, both these Medusae were most numer- 
ous near shore, Aurelia particularly so in the bays and harbors; and 
they are so large and conspicuous that they are easily seen on the 
surface, even if not taken in the net. 
In Massachusetts Bay, early in July, we saw many Aurelia, though, 
as it chanced, no Cyanea; but on our return thither at the end of 
August, both genera were seen floating on the surface at various spots 
between Gloucester and Provincetown. During our work along the 
coast between Cape Ann and Portland, the two genera were frequently 
recorded, both in the nets and on the surface, both of them being 
generally distributed in the coast waters in this region. But on the 
run to Platt’s Bank we left them behind at about Lat. 43° 15’, long. 
69° 50’, and saw and took neither of them on the course thence to 
Jeffrey’s Bank (Station 25) or until approaching the mouth of Penob- 
scot Bay, where (Station 26) both species once more appeared on the 
surface. Similarly on the run from Cape Elizabeth toward Nova Scotia 
the last Aurelia was seen at about 69° long. 43° 30’ lat., and neither 
genus was found until we approached the coast again between Mt. 
Desert and Grand Manan. In the Grand Manan Channel, at East- 
port, and during the run westward along the coast, both were seen 
frequently, except at Stations 38 and 39. But neither species was 
encountered anywhere in as great abundance as they are often seen, 
except off Cape Cod, on August 29, when Aurelias were passed in 
