612 



MEDUS.E OF THE WORLD. 



a pair of these projections. 8 adradial rows of tentacles arise from the suhumbrella in the 

 intervals between the sense-organs; these rows being somewhat shorter than the intervals 

 between them. The 4 mouth-arms are only one-third as long as bell-radius. The central 

 stomach is less than one-fifth as wide as the bell, and there are 4 interradial clusters of 

 gastric cirri. 8 radial-canals, each of which gives rise to several side branches, arise from 

 the central stomach in the radii of the sense-organs. A simple and a forked canal arise in 

 each of the 8 radii of the velar lappets. These radial-canals anastomose to some extent and 

 fuse with a wide ring-canal in the zone of the sense-organs. On its outer side the ring-canal 



FIG. 391. Sthcnonia albida, according to Eschscholtz, after VanhofTen 

 in Nordisches Plankton. 



gives off a trident-shaped vessel in each rhopalar-radius and a pair of vessels in each velar 

 lappet-radius. Bell whitish, gonads and canals milk-white. 



Found by Eschscholtz in Awatscha Bay, coast of Kamtschatka, Siberia. 



Genus PHACELLOPHORA Brandt, 1835. 



Phacel/ophora, BRANDT, 1835, Mem. Acad. Imperiale des Sci. St. Petersbourg, ser 4, tome 2, p. 224; 1838, Mem. Acad. Imperiale 

 des Sci. St. Peter sbourg, Sci. Nat., ser. 6, tome 4, p. 365. HA ECKEL, 1880, Syst. der Medusen, p. 549. VANHOFFEN, 1906, 

 Nordisches Plankton, Nr. u, p. 58. BROWNE, 1908, Trans. Royal Soc. Edinburgh, vol. 46, p. 247. 



Heccfpdecomrna, BRANDT, Ibid., p. 380. 



Cal/inema, VERRILL, 1869, American Journ.Sci., ser. 2, veil. 48, p. 117; Ann. and Mag. Nat. Hist., vol.4, p. 161. FEWKF.S, 1888, 

 Bull. Mus. Comp. Zool. at Harvard College, vol. 13, p. 235. 



Pharellof>hora= HecctzJecomma, MAAS, 1906, Fauna Arctica, Bd. 4, Lfg. 3, pp. 506, 512^ Jena. 



The type species is P. camtschatica, described by Brandt, 1838, from the North Pacific. 



