44 CYANEID^. 



PHACELLOPHORA Br. 



Phacellophora Br. (non Huxl.). Prod. Mem. Acad. St. Pet., p. 223. 1835. 

 PhacellopTiora Less. Zooph. Acal., p. 343. 1843. 

 Phacellophora Agass. Cont. Nat. Hist. U. S., IV. p. 161. 1862. 



Phacellophora camtschatica Br. 



Phacellophora camtschatica Br. Mem. Acad. St. Petersb., p. 366, PI. 8. 1838. 

 Phacellophora camtschatica Less. Zooph. Acal., p. 344. 1843. 

 Phacellophora camtschatica Agass. Cont. Nat. Hist. U. S., IV. p. 161. 1862. 



The number of species of large Discophorous Medusae found on the 

 western coast of North America gives to the Acalephian Fauna of 

 California a very characteristic stamp, when compared with that of 

 the eastern coast. 



Petropaulowsk (Mertens) ; San Francisco Bay (A. Agassiz). 



Family OYANEIDiE Agass. 



Cyaneidce Agass. Cont. Nat. Hist. U. S., Vol. IV. pp. 114, 161. 1862. 



CYANEA Per. et Les. 



Cyanea Per. et Les. Ann. du Mus., XIV. p. 51. 1809. 



Cyanea Esch. Syst. der Acal., p. 67. 1829. 



Cyanea Cuv. Reg. An. 1818. 



Cyanea Less. Zooph. Acal., p. 379. 1843. 



Cyanea Agass. Cont. Nat. Hist. U. S., Vol. IV. p. 161. 1862. 



Cyanea arctica Per. et Les. 



Cyanea arctica Per. et Les. Ann. Mus., XIV. p. 51. 1809. 



Cyanea arctica Agass. Cont. Nat. Hist. U. S., IV. pp. 87, 162; Vol. III., Pis. 3, 4, 5, S''; PI. 10, 



Figs. 1-17, 19-21, 23-30, 33-35, 37-38 ; PL 10% Figs. 1-4% 5-12% 14, 15, 17-40. 

 Medusa capillata Fab. {non Lin.) Faun. Groenl. No. 358. 1780. 

 Cyanea Postelsii Gould (jwn Br.). Rep. Inv. Mass., p. 347. 

 Cyanea Postelsii Stimps. Mar. Inv. Grand Manan, p. 11. 1853. 

 Cyanea arctica MoRCH. In Naturh. Bid. til en Besk. af Gronl., p. 95. 1857. 

 Cyanea arctica Packard. Canad. Nat. Dec. 1863. 



This species attains an enormous size. I measured myself a speci- 

 men at Nahant, the disk of which had attained a diameter of seven and 

 a half feet, the tentacles extending to a length of more than one 

 hundred and twenty feet. Our total ignorance of the young of these 

 large DiscophoraB is due to their peculiar habits. As has already been 

 suggested, they probably remain a great part of the time groping about 



