50 MELANASTER. 



POLYBOSTRICHA Br. 



Pohjhostriclia Br. Mem. Acad. St. Petersb., p. 384. 1838. 

 Pohjhostricha Agass. Cont. Nat. Hist. U. S., IV. pp. 126, 166. 1862. 



The species of Pol_ybostriclia and Melanaster which are here enumer- 

 ated were observed during a cahn off the bar of San Francisco ; and 

 although tolerably accurate notes were taken at the time, yet they are 

 not sufficient to warrant the description of these species under new 

 names. They are therefore mentioned here more for the sake of the 

 geographical distribution of these genera ; and as some of the marme 

 animals of Kamtschatka are found on the coast of California, it is by 

 no means improbable that the species I have referred to the figures of 

 Brandt -will prove, on closer examination, to be identical with them. 



Polybostricha helvola Br. 



Polybostricha helvola Br. Mem. Acad. St. Petersb., PI. 15, p. 384. 1838. 

 Polybostricha helvola Agass. Cont. Nat. Hist. U. S., IV. p. 166. 1862. 

 Chrysaora helvola Less. Zooph. Acal., p. 402. 1848. 

 Polybostricha sp. A. Agass. ; in Agassiz's Cont. Nat. Hist. U. S., IV. p. 166. 



Aleutian Islands, Sitka (Mertens) ; Punta de los Reyes, California 

 (A. Agassiz). 



MELANASTER Agass. 



Melanaster Agass. Cont. Nat. Hist. U. S., IV. pp. 126, 166. 1862. 

 Chrysaora Bk. (p. p-)- Mem. Acad. St. Petersb., p. 385. 1838. 



Melanaster Mertensii Agass. 



Melanaster Mertensii Agass. Cont. Nat. Hist. U. S., IV. p. 166. 1862. 

 Chrysaora melanaster Bk. Mem. Acad. St. Petersb., Pis. 16, 17, p. 385. 1838. 

 Chrysaora melanaster Less. Zooph. Acal., p. 403. 1843. 

 Melanaster sp. A. Agass. ; in Agassiz's Cont. Nat. Hist. U. S., IV. p. 166. 1862. 



Kamtschatka and Avatska Bay (Mertens) ; off San Francisco Bar 



(A. Agassiz). 



