EUCOPE ARTICULATA. 



89 



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

 at once. 



This species is closely allied to the Gcmvpanularia gelatinosa of Van 

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

 of structure of the Hydrarium, especially the reproductive calycles and 

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

 species. The mode of branching is the same in both. Compare Van 

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

 figures of the Medusse here given. 



Point Judith (Leidy) ; Beverly, 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. Hydromedusariiun. 



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



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



Eucope artieulata A. Agass. 



This species is so closely allied to Eucope piyriformis that the Me- 

 dusae can hardly be distinguished. The Medusa of Eucope artieulata 

 (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 Medusae of Eucopidse. The 



Hydrarium is at once recognized by the extraordinary length of the 

 ringed branch supporting the sterile Hydi-ae, the cups of which are quite 

 deep and narrow. The reproductive calycle (Fig. 131) resembles in 

 shape that of Ohelia commissurcdis, but is in addition supported upon 



Fig. 130. Quarter of the disk of Eucope artieulata ; magnified. 

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



NO. II. 12 



