46 CYANEA VERSICOLOR. 



about, measuring all the way from a quarter of an inch to three inches 

 in diameter. On my return to the same place at seven o'clock, al- 

 though not a breath of air had ruffled the surface, they had all re- 

 turned to deeper water. The early habits of the young Cyanea may 

 be only one of many similar instances of early rising among Acalephs. 

 Fig. 67 is copied from the Contributions of Professor Agassiz. 



Greenland (Fabricius) ; Northeastern Coast of America, from Bay of 

 Fundy to Boston Harbor (Gould, Agassiz) ; Long Island Sound, Vine- 

 yard Sound (A. Agassiz). 



Cat. No. 326, Chelsea Beach, Oct. 1851, L. Agassiz. 



Cat. No. 327, Nahant, Aug. 1858, L. Agassiz. 



Cat. No. 328, Nahant, Aug. 1858, L. Agassiz. 



Cat. No. 369, Gulf of St. Lawrence, 1861, Anticosti Expedition. 



Museum diagrams Nos. 12, 13, after L. Agassiz. 



Cyanea fulva AGASS. 



Cyanea fulm AGASS. Cont, Nat. Hist. U. S., IV. pp. 119, 162. 18G2. 



The youngest specimen of Cyanea which has been observed meas- 

 ured about one third of an inch in diameter. Its peculiar habit of 

 always remaining at the bottom of the vessel in which it w r as kept, 

 seemed to explain until the observations, above mentioned, of the 

 early habits of Cyanea arctica the periodic appearance of adult 

 Medusae at certain times of the year, simply for the purpose of spawn- 

 ing, while for the remainder of their life they remain groping near 

 the bottom. In general appearance the young Cyanea resembles the 

 Cyaneida3. It has but few marginal tentacles, the centre one being 

 developed far above the others ; the separate lobes of the actinostome 

 are, however, distinct, and do not form the inextricable mass of curtains 

 surrounding the actinostome of a Cyanea. The digitate appendages 

 are developed in pairs on each side of a median line, indicating the 

 position of the future genital organs. This gives us at once the rela- 

 tive position of the Cyaneidse and Pelagidse, the latter being only per- 

 manent forms resembling somewhat embryonic Cyaneidse. 



Long Island Sound (L. Agassiz) ; Vineyard Sound (A. Agassiz). 



Cat. No. 331, Naushon, A. Agassiz, Sept. 1861. Young. 



Cyanea versicolor AGASS. 



Cyanea versicolor AGASS. Cont, Nat. Hist. U. S., IV. pp. 119, 162. 1862. 



South Carolina (L. Agassiz). 



Cat. No. 329, Charleston, S. C., 1852, L. Agassiz. 



