SKMAEOSTOME.E — PHACELLOPHORA. 



615 



The genital cross is about one-third (55 mm.) as wide as the bell itself. The 4 extruded, 

 pouch-like gonads with their swollen, folded, wart-like genital-sacs resemble those of Cyanea. 

 The 4 gonads are separated by very narrow intervals in the 4 perradii. The 4 wide, curtain- 

 like lips also resemble those of Cyanea and are not quite as long as the radius of the bell. 

 The central stomach gives rise to 16 rhopalar radial vessels which fork outwardly; and also 

 to 48 (3X 16) inter-rhopalar radial-canals which are simple and do not fork. Lateral anasto- 

 moses between these radial-canals are very rare. Ring-canal very well developed, about 3 

 mm. wide, while the radial-canals are each about 2.5 mm. wide, being about as wide as the 

 spaces between them. The ring-canal gives rise to from 5 to 8 straight, simple, blindly-ending, 

 centrifugal vessels in each velar lappet. 



KiG. 1193. — Phacellophora amhigua, according to Brandt, after Vanhoffen, in Nordisches Plankton. 



In formalin the exumbrella is yellowish-milky in color, the canal-system milky and 

 translucent, the gonads dull orange to ocher, and the lips of a lighter hue of the same color. 



Found at Naples and Messina, Mediterranean, and off the coast of Japan f Kishinouve). 



This species is closely related to P. ainbigiia, but is distinguished by having only 16 wide, 

 simple, velar lappets instead of 32 narrow ones, as in P. amhigua. P. stcula is probably 

 only an arrested variety of P. amhigua in which the velar lobes remain entire and uncleft. 



Phacellophora ambigua Haeckel. 



Hacctrdecomma amhiguum, Brandt, 1838, Mem. .Acad. Sci. St. Petersbourg, Sci. Nat., ser. 6, tome 4, p. 380, taf. 27, 28. — Agassiz, 



A., 1865, North .Amer. .Acal., p. 43. 

 Phacellophora amhigua^ Haeckel, 1880, Syst. der Medusen,p. 550. — Vanhoffen, 1906, Nordisches Plankton, Nr. 1 1, p. 58, fig. 24. 



Bell flatter than a hemisphere, 150 to 200 mm. wide. There are 64 (4X16) evenly 

 rounded, marginal lappets all similar each to each. The sense-organs are sunken within deep, 

 narrow clefts. Mouth-arms broad, curtain-like, similiar to those of Cvanca instead of being 

 Aurellia-Vike, as in P. camtschatica. About 9 tentacles in each of the 16 linear clusters. The 

 16 rhopalar canals are forked and between them are 48 (3X16) simple, unbranched, radial 



