PLANKTON OF THE GULF OF MAINE 
351 
Although we have taken Phialidium over the basin as well as near shore, it 
occurs most regularly within a comparatively short distance of the land, as might 
be expected of any neritic animal that passes the greater part of the year attached 
Fig. 98. — Occurrence of the hydromedusa Phialidium languidium (®) and of floating hydroids (X). The large symbols 
mark the swarms of Phialidium; the hatched curve its approximate offshore boundary 
to the bottom in shoal water. There is evidence that Georges Bank and Browns 
Bank serve as nurseries for it, for we found it on the northwestern part of the former 
on August 13, 1926. We have no record for it in the southeastern part of the 
basin or in the Eastern Channel. 
