CLYTIA BICOPIIORA. 79 



glands, extending towards the base of tlie proboscis. The Hydrarium 

 (see figure of Professor Agassiz in Vol. IV. PI. '2d, Fig. 6) grows from 

 three quarters to an inch in height, in small tufts attached to Fncus ; the 

 calycles are strongly compressed (Fig. Ill), and difler as much in their 

 proportions as those of C. ci/linclrica, when seen from the broad or from 

 the narrow side. This sj^ecies may ^-et prove identical with the Chjtla 

 JoJinnto)ii of Alder. According to the iigure of Wright of the Medusa 

 of Cam2)amdaria Johnstoni, it can hardly be distinguished from the 

 Medusa of our Clytia hicophora ; the Medusa of C. vohih'dis figured by 

 Hincks resembles also closely our Clytia Medusa^. The Medusa figured 

 bj- Dalyell as the 3"oung of M. Jimhriatu, on PI. pig. m. 



52, Fig. 4, Rare and Remarkable Animals of 

 Scotland, is luidoubtedly a 3'oung Medusa of C. 

 JohnstonU to judge from its characteristic attitude. 

 If the figure which Gosse has given of the calycle 

 of this same species in his " Devonshire " is correct, 

 there can be but little question as to their specific 

 difference ; the peculiar species figured by Gosse 

 has, however, not been noticed by other English 

 observers. The Meduste of Chjtia cylindrica and 

 of Clytia bicojjhora are so alike, immediately after 

 their escape from the reproductive calycles, that 

 wdien the development of Clytia cylindrica was first discovered, the 

 Medusae which are here figured as Clytia bicojihora (Fig. 41, Agassiz's 

 Cont. Nat. Hist., p. 307) were mistaken for the adult of the Medusfe of 

 Clytia cylindrica. As the Clytia bicophora is very common at Nahant, 

 the complete development of the Medusa has been traced, and the 

 error is here corrected. 



Ejistport, Maine (W. Stimpson) ; Massachusetts Bay (Agassiz) ; Vine- 

 yard Sound and Naushon (L. and A. Agassiz). 



Cat. No. 133, Eastport, Maine, July, 1852, W. Stimpson. Hydrome- 

 dusarium. 



Cat. No. 134, Beverly, Mass., July, 18G1, A. Agassiz. Hydrarium. 



Cat. No. 135, Vineyard Sound, July, 1849, L. Agassiz. Hydromedu- 

 sarium. 



Cat. No. 136, Grand Manan, August, 1857, J. E. Mills. Ilydromedu- 

 sarium. 



Cat. No. 137, Nahant, Dec. 1855, H. J. Clark. Hydromedusarium. 



Cat. No. 154, Eastport, Maine, July, 1852, W. Stimpson. 



Cat. No. 401, Nahant, June, 1802, A. Agassiz. Hydromedusarium. 



Cat. No. 443, Nahant, June, 18G4, A. Agassiz. Medusa. 



Museum diagram No. 17, after L. and A. Agassiz. 



Fig. 111. .Stt'rilu Hydra and ivinudiictive calvilc, sicn fioiu tlio liroad side. 



