EUCOPE ARTICULATA. 89 



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

 at once. 



This species is closely allied to the Campanularia yelatinosa of Van 

 Beneclen, and to the Campanularia 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, PL 1, Fig. 1, Campanulaires de la Cote d'Ostende, and the 

 figures of the Medusas 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. 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 Eucope, pyriformis that the Me- 

 dusas 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 Medusas of Eucopidas. The 



Fig. 130. 



Hydrarium is at once recognized by the extraordinary length of the 

 ringed branch supporting the sterile Hydras, the cups of which are quite 

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

 shape that of Obelia commissuralis., but is in addition supported upon 



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

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

 NO. II. 12 



