EUCOPE ARTICULATA. 



89 



tions. There are from nine to twelve Medusa^ growing in each calycle 

 at once. 



This species is closely allied to the Camj)aniilaria gelatinosa of ^'an 

 Beneden, and to the Camjjamdaria dichotoma of Dalyell. The details 

 of strncture of the Hydrarium, especially the reproductive calycles and 

 the stem of the sterile Hydra, seem to prove that they are diflercnt 

 species. The mode of branching is the same in both. Comj^are Van 

 Beneden, PI. 1, Fig. 1, Campanulaires de la Cote d'Osteude, and the 

 figures of the Medusae here given. 



Point Judith (Leid}') ; Bevei'ly, Massachusetts Bay (Alex. Agassiz) ; 

 Grand Manan (Mills). 



Cat. No. 74, Beverly, Mass., July, 1861, A. Agassiz. Hydromedusarium. 



Cat. No. 75, Nahant, Mass., July, 1861, A. Agassiz. Hydromedusarium. 



Cat. No. 76, Grand Manan, Aug. 1857, J. E. Mills. Hydrarium. 



Cat. No. 77, Grand Manan, Aug. 1857, J. E. Mills. Hydrarium. 



Eucope articulata A. Agass. 



This species is so closely allied to Eucojie pyriformh that the Me- 

 dusaj can hardly be distinguished. The Medusa of Eucope articulata 

 (Fig. 130) has more slender marginal tentacles, and the lips of the 

 actinostome are deeply cleft and extremely movable, which is quite 

 the contrary of what we find in young Medusa? of Eucopidaj. The 



Fig. 131. 



Fig. 130. 



Hydrarium is at once recognized by the extraordinary length of the 

 ringed branch supporting the sterile Hydra;, the cu2)s of which are quite 

 deep and nari'ow. The reproductive calycle (Fig. 131) resembles in 

 shape that of Ohella commissuralls, but is in addition supported upon 



Fig. 130. Quarter of the di.sk of Eucope articulata ; magnified. 

 Fig. 131. Portion of a Hydrarium of Eucope articulata. 

 NO. II. 12 



