SEMAEOSTOMK.E PHACELLOPHORA, PORALIA. 



617 



in each velar lappet and a trident-shaped canal to each sense-organ and its adjacent lappets. 

 Usually the outer ends of these blind canals are simple, but occasionally they bifurcate 



< n K- .505)- 



Disk transparent, the radiating and circular canals slightly brown in color. Sense-organs 

 glistening white. Nematocyst-bearing edges of tentacles white. Central stomach oran;e- 

 yellow, the mouth-arms citron-yellow, the gpnads yellowish-brown. 



1 his species is found at Eastport, Maine, and in the Bay of Fundy. It is very rare, and 

 has been taken there only by Verrill and Fewkes. In 1908 Browne describes a closely allied 

 or identical species from the South Atlantic about 200 miles east of Montevideo, South America. 



I am gratefully indebted to Professor Verrill for permitting me to make drawings (figs. 

 j()4, 3<)5) ot the type specimen preserved in the Peabody Museum at Yale University 



This species is closely related to P. ambigua, but is distinguished by its greater number of 

 velar lappets and radial-canals. The velar lappets are also shorter than in P. ambigua. 



Genus PORALIA Vanhoffen, 1902. 



Poralia, VANHIIFFEN, 1902, Wissen. Ergcb. deutsch. Tiefscc Expedition, Dampier )'/,///,/, Bil. 3, Lfj>. 1, p. 40. BKIKI.OW, H. B., 

 1909, Mem. Museum Comp. Zool. at Harvard College, vol. 37, p. 4^, plate 13, figs. 1-5. 



GENERIC CHARACTERS. 



Ulmandae closely related to Phacellophora. \\ith numerous simple radial-canals, and a 

 ring-canal, which on its outer side gives rise to blindly-ending vessels. The gonads form a ring 



Fir.. ^<jv Phacdhphorti ornnta. Portion of bell-rim. 



of Outpocketings m the lateral wall of the stomach extending entirely around the base of the 

 stomach, but interrupted at frequent intervals by vertical thickenings of the stomach wall. 

 Tentacles ( ?) There are no subgenital pits in the floor of the subumbrella. The mouth parts 

 are imperfectly preserved but appear to resemble those of ('\'<in,-n or Phacellophora. 



This genus was founded by Vanhbffen, bur his single specimen was imperfect and imma- 

 ture, and our knowledge of it is chiefly due to the studies of Bigclow upon the more peitcct 

 specimens found by the Albatross in the eastern part of the tropical Pacific. 



The type species is Poralia rufescens Vanhoffen, from the Indian Ocean and tropical 

 Pacific. 



Poralia rufescens Vanhbffen. 



Poralia rufescrns, VANHOFFF.N, 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer FalJivia, B.I. -,. I.fg. i , p. 41, taf. 4, 

 fign. 15-16; ii)oS, Deutsche Sudpolar Expedition, Bd. 10, Zool. z, p. 47. Bicr.Low, H. B., 1909. \l. MI. Museum Comp. 

 Zool. at Harvard College, vol. 37, p. 45, plate 13. 



In Bigelow's largest specimen the bell was 250 mm. in diameter. There were apparently 

 16 rhopalia, although some of these were destroyed so that the exact number was not deter- 

 mined with certainty. The rhopalia resemble those of Phacfllop/wra and are set within deep 



