76 GENERAL DIRECTIONS. 



Tubularia indivisa can always be found nt low tide 

 clinging in clumps to the piles of Beverly Bridge, just be- 

 low low-water mark. With it are associated great num- 

 bers of Campanulariee and Obelias. 



If one wishes the common Sertnlaria (S. pumila), one 

 of the best collecting places for this most common hydroid 

 is Revere Beach at low tide. Almost every fragment of 

 Lam in aria or "oarweed"' washed up after a storm will be 

 found to be peopled with this delicate species. It is more- 

 over common at all times of the year. 



The shells of Lunatia inhabited by the so-called hermit 

 crab are favorite habitats for Hydractinia echinata, but it 

 is also found encrusting submarine objects, floating logs, 

 water-soaked ropes, and the under surface of buoys. 



I am not acquainted with a single locality which will al- 

 ways reward the collector with numerous specimens of the 

 different genera of Ctenophoraand Siphonophora, although 

 it is safe to say that a few weeks at Eastport with constant 

 examination of the water about the wharves will probably 

 reveal a limited number of specimens of Beroe and Bo- 

 lina, and possibly an unexpected multitude of Nanomia 

 car a. 



I have found the ebb tide at the "draw" at Beverly 

 Bridge to sometimes bring down many large examples of 

 the acraspidote medusa, Auretiaflavidula, but as with all 

 floating jelly-fishes no locality can be mentioned where it 

 can be found without failure in quantities. Gyanea arc- 

 tica may sometimes be seen by the score about the Boston 

 docks and near the bridges, yet many visits to these places 

 might be made without seeing a single specimen. Dacty- 

 lometra and Callinerna are rare Acraspeda. 



Our most common Actinian, A., marginata, can always 

 be collected in abundance on the piles of Beverly Bridge. 

 This is one of the most easily obtained of all of our ma- 



