G12 



MEDUS.B OF THE WORLD. 



a pair of these projections. 8 adradial rows of tentacles arise from the subumbrella 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. — Sthenonia albida, according to Eschscholtz, after Vanhoffen 

 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. 



PhactUophornj Brandt, 1835, Mdm. Acad.Impi^rialc dcs Sci. St.Pdtersbourg, ser 4, tome z, p. 224; 1838, Mem. Acad. Imperialc 

 dcs Sci. St. Pctcrsbourg, Sci. Nat., ser. 6, tome 4, p. 365. — HAr.cKri., 1880, Syst. dcr Aledusen, p. 549. — Vanhoffen, 1906, 

 Nordisches Plankton, Nr. 11, p. 58. — Browni:, 1908, Trans. Royal See. Edinburgh, vol. 46, p. 247. 



Heccadecomma, Brandt, IbiJ., p. 380. 



Ca//inemfl, Verrill, 1869, American Journ.Sci., ser. 2, vol. 48, p. 117; Ann. and Mag. Nat. Hist., vol. 4, p. 161. — Fewkes, 1888, 

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



Phactllophora= Htccxdecomma, Maas, 1906, Fauna Arcrica, Bd. 4, Lfg. 3, pp. 506, 512, Jena. 



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



