COELENTERATA 49 



Obelia flabellata Hincks 



PLATE II. Fig 7 



Very similar to the above and difficult to 

 distinguish from it; hydranth-bearing stalks arise 

 from shoulders of the branches instead of directly 

 from the branches as in 0. commissar alls. 



Rarer than the above ; known from New England 

 and northern New Jersey (Shark River); medusae 

 not reported from New Jersey. 



Obelia longissima Pallas 



PLATE II. Fig. 9 



Colony longer than the two preceecling species, 

 reaching a length of 12 to 14 inches; main stem 

 fascicled and branched; stalks annulated; hydro- 

 thecae with numerous very small teeth. 



Reproductive polyps ovate with collared apert- 

 ures. Medusae with 20 to 24 tentacles when 

 liberated. 



Reported from the coast of Massachusetts; occa- 

 sionally washed on the New Jersey beaches in con- 

 siderable quantities in the spring of the year. 



Obelia gelatinosa Pallas 



PLATE II. Fig 11 



Very similar to the above; stalks shorter (3 to 

 5 annulations) ; hydrothecae triangular and with 



