582 



MEDUS.E OF THE WORLD. 



this medusa. He gives good figures of it showing the considerable depth ot the adradial clefts 

 between the lappets. 



Chrysaora helvola var. calliparea. 



(?) Cyanea calliparea, REYNAUD, 1830, Lesson's Centime Zoologique, p. 67, planche 20. 

 Chrysaora calliparea, HAECKEL, 1880, Syst. der Medusen, p. 516. 



See synoptic table of forms of Chrysaora. 



This medusa is reported from Pondichery and Zanzibar, and our knowledge of it is still 

 imperfect. 



Chrysaora helvola var. chinensis. 



Chrysaora chinensis, VANHOFFEN, 1888, Bibliotheca Zoologica, Heft. 3, p. 16. 



In the single specimen described by VanhofFen the disk is 70 mm. wide and 30 mm. high. 

 Exumbrella thickly covered with numerous, very small warts arranged in a scale-like manner 

 from summit to margin. Ocular and tentacular marginal lappets of equal width and length, 

 longer than wide, and each one ends in a blunt point; lappets overlap each other on their 

 sides and this causes the ocular lappets to appear smaller and sharper than the tentacular 

 lappets. The 16 radiating stomach-pouches are all of equal width at periphery of central 

 stomach. The septa bordering the 8 ocular pouches trend so as to become wider apart for 

 the proximal three-fourths of their lengths, so that the ocular pouches are about twice as wide 

 as the tentacular ones at this zone. The septa then trend toward the ocular radii so that at 



the bell-margin the 8 ocular stomach- 

 pouches are only half as wide as the 8 

 tentacular ones. The 4 lips, or palps, 

 are each 7 times as long as the radius 

 of the disk. Near the mouth-opening 

 they are almost as wide as bell-radius 

 and are curtain-like. Midrib of each 

 mouth-arm well developed, the folded 

 margins thin. Outer parts of palps 

 about one-third as wide as bell-radius, 

 not tapering outwards, but ending 

 bluntly. Color (?) Gonads (?) Tenta- 

 cles (?) Found near Hongkong, China, 

 in October. 



This form is distinguished by its 



FIG. 366. Chrysaora helvola, according to Brandt, after Vanhoffen, 

 in Nordishes Plankton. 



peculiar exumbrella warts and its very 

 long mouth-arms. It is separated from 

 Chrysaora calliparea by its long, pointed, marginal lappets. 



Chrysaora melanaster Brandt. 



Chrysaora melanaster, BRANDT, 1838, Mem. Acad. Sci. St. Petersbourg, Sci. Nat., ser. 6, tome 4, p. 385, taf. 16, 17. HAECKEL, 

 1880, Syst. der Medusen, p. 515. FEWKES, 1889, Bull. Essex. Inst. Salem, vol. zi, No. 7, p. izi. VANHOFFEN, E., 1906, 

 Nordisches Plankton, Nr. n, p. 49, fig. 12. 



Mclanailer menensii, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, pp. 126, 166. 



Melanaster, sp., AGASSIZ, A., 1865, North Amer. Acal., p. 50. 



See synoptic table of species of Chrysaora. 



This abundant North Pacific form is found from Kamtschatka to California. Bell 

 with reddish-brown radial lines extending from center to margin. Marginal sense-organs 

 bright yellow and brown. Tips of tentacles are red. When old it develops 48 lappets, but 

 the tentacles remain 32. 



It is closely allied to Dactylometra quinquecirrha of the North Atlantic, and C. gilberti 

 is one of its varieties. 



Chrysaora melanaster var. "gilberti" Kishinouye. 



Chrysaora gilberti, KISHINOUYE, 1899, Zool. Anzeiger, Bd. 22, p. 44, I fig. 



Distinguished by its semicircular lappets all similar each to each and its relatively long 

 tentacles. It is probably only a variety of C. melanaster. 



