A FEW CCELENTERATES OF WOODS HOLL. IO9 



entitled to identity, hence I am disposed to suggest for it the 

 name E. prolifica, which may be specific or varietal, as the results 

 of later comparison of material may warrant. 



Aglaophenia. — During the summer I collected from masses 

 of Sargassum which was blown into the harbor from Vineyard 

 Sound, a species which seems in all essentials identical with 

 Fewkes' A. minuta. The hydroids were entirely devoid of 

 gonangia, as was the case with the species as originally described 

 by Fewkes, whose account was extremely brief, and without 

 figures — " Found growing in great abundance on an Alga over 

 the fronds of which the hydrorhiza extends." {Bull. Mits. Comp. 

 Z00L, Vol. VIII., p. 132.) 



Nutting has since described and figured the gonangia, using 

 material collected by Fewkes, and indicated as types, though as 

 already mentioned, the original description made no mention of 

 the gonosome. 



In a recent paper on " Bermuda Hydroids " Mr. E. D. Cong- 

 don has a brief note on the species, found there on Sargassum, 

 but as in my specimens, devoid of gonangia. 



So far as I am aware, the present is the first record of the 

 species at Woods Holl, and this mention of it seems therefore 

 important. 



Obelia. — The present note refers only to a single species, and 

 of that only to the medusa, which up to the present time, seems 

 to have been entirely unknown, or at any rate undescribed. 



The material was collected by Mr. Geo. M. Gray at Woods 

 Holl in April, 1906, and in the aquarium numerous medusae 

 were liberated. The hydroid was clearly O. flabellata Hincks. 



The following synonymy is given by Haeckel, " Das Syst. d. 

 Medusen," p. 177 : 



Thaumantias plana Sars. , 1835. 



Campanularia flabellata Hincks, Ann. Mag. Nat. Hist., 3d, Vol. 



XVIII., p. 297. 

 Obelia flabellata Hincks, Brit. Hydr. Zoophytes, p. 157. 

 Eucope plana Agassiz, Cont. Nat. Hist. U. S., Vol. IV., p. 351. 

 Obelia plana Haeckel, vide supra. 



