44 CYANEIDiE. 



PHACELLOPHORA Br. 



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

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

 Phacellophora Agass. Cont. Nat. Hist. U. S., IV. p. 161. 18G2. 



Phacellophora camtschatica Br. 



PhaceUopJiora camtschatica Br. Mem. Acad. St. Petei-sb., p. 366, PI. 8. 1838. 

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

 Phacellophora camtschatica Agass. Cont. Nat. Hist. U. S., IV. p. 161. 18G2. 



The number of sjiecies of large Discophorous Medusre found on the 

 westei'ii coast of North America gives to the Acalephian Fauna of 

 Cahfornia a very characteristic stamp, when compared with that of 

 the eastern coast. 



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



Family CYANEIDiE Agass. 



Cyaneido! Agass. Cout. 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. 



Ci/anea EscH. Syst. der Acal., p. 67. 1829. 



Cyanea Cuv. Reg. An. 1818. 



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



Cyanea Agass. Cout. 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. HI., Pis. 3, 4, 5, 5» ; PI. 10, 



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

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

 Cyanea Postilsii G<>ri.i> (non Br.). Rep. Inv. ^Slass., p. 347. 

 Cyanea Postelsii Stimi's. Mar. Inv. CJrand Manan, p. 11. 1853. 

 Cyanea arctica Morch. In Naturh. Bid. til en Bcsk. 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 extendin"; to a lencrth of more than one 

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

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

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



