SEMAEOSTOME^ PHACELI.OI'HOUA, I'OKALIA. 



617 



in each velar lappet ami a trident-shaped canal to each sense-organ and its adjacent lap|)ets. 

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



^fig- 395)- 



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

 glistening white. Nematocyst-bearing edges of tentacles white. Central stomach orange- 

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



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

 has been taken there onh' by Verrill and Fewkes. In H)o8 Browne describes a closely allied 

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



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

 394, 395) of 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. (iiuhii^ua. 



Genus PORALIA Vanhoffen, 1902. 



Poraliti, Vanhoffen, 1902, W'isscn. Ergeb. deutsch. Tiefsee Expedition, Dampfer Valdivia^ Bd. 3, Lfj^. 1, p. 40.— Bigklow, H. B., 

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



GENERIC CHARACTERS. 



Ulmaridas closely related to Phacellophora. With numerous simple radial-canals, and a 

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



Fig. 395. — Pharellof^hora ornata. Portion of bell-rim. 



of outpocketings in the lateral wall of the stomach extending entirely around the base of the 

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

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

 are imperfectly preserved but appear to resemble those of Cyanea or Phacellophora. 



This genus was founded by Vanhoffen, but his single specimen was imperfect and imma- 

 ture, and our knowledge of it is chiefly due to the studies of Bigelow upon the more perfect 

 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 Vanhoffen. 



Poralia rufncrns, Vanhoffen, 1902, Wissen. Ergcb. deutsch. Tiefsce Expedition, Dampfer Valdivia, Bd. 3, Lfg. I, p. 41, taf. 4, 

 fign. 15-16; 1908, Deutsche Siidpolar Expedition, Bd. 10, Zool. 2, p. 47.— BiGEiow, H. B., 1909, Mem. Museum Comp. 

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



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

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

 mined with certainty. The rhopalia resemble those oi Phacellophora and are set within deep 



