PLANKTON OF THE GULF OF MAINE 



343 



The young medusae of Staurophora appear off Cape Cod and probably else- 

 where along the coast farther north during the last half of April. 87 In 1920, for 



Fig. 95.— Occurrence of the hydromedusa Meliccrtum campanula, and of the ctenophore Bolinopsis infundibulum. X. 

 locality for Melicertum; #, locality records for Bolinopsis 



example, we noted them first off the northern end of Cape Cod on the 17th of that 

 month (station 20117) and found the tiny medusa? (about 5 to 15 millimeters in 

 diameter) plentiful on the surface in Massachusetts Bay on the 20th (station 20119). 



^According to Mayer (1910) this takes place early in the month, but such has not been our own experience. 



