738 EDWARD T. BROWNE. 



loops, but not meeting on the inner side. The marginal bulbs are large hollow balls in 

 direct communication with the circular canal, and are externally covered with nematocysts. 



Genus Gomonemus, A. Agassiz, 1862. 



Generic Character. Petasidae with numerous uniform tentacles, each having an adhesive 

 disk. 



G. vertens, A. Agassiz, 1862. North Pacific; British Columbia. 



G. suavaensis, Agassiz and Mayer, 1899. Tropical Pacific ; Fiji. 



0. aphrodite, Mayer, 1894 and 1900. Tropical Atlantic; Florida. 



G. agassizii, Murbach and Shearer, 1903. North Pacific; Aleutian Is. and Japan (Kirk- 

 patrick, 190.3). 



G. murbachii, Mayer, 1901. North Atlantic ; Massach. U.S.A. 



G. pelagicus, Bigelow, 1904. Indian Ocean ; Maldive Is. 



Genus Gonionemoides, Mayer, 1900. 



Generic Character. Petasidae with numerous tentacles, of which there are two distinct 

 kinds. A series (primary) with adhesive disks and another series (secondary) without adhesive 

 disks and with more numerous and larger bands of nematocysts. 



G. geophila, Mayer, 1900. Tropical Atlantic; Florida. 



Genus Vallentinia, Browne, 1902. 



Generic Character. Petasidae with two distinct kinds of tentacles. Four solid perradial 

 tentacles with terminal suckers, and many hollow tentacles with bands of nematocysts, but 

 without suckers. 



V. falklandica, Browne, 1902. South Atlantic; Falkland Is. 



Family Geryonidae, Eschscholtz, 1829. 



Trachomedusae with four or six radial canals, in the course of which are situated leaf- 

 shaped gonads. Blind centripetal canals. Stomach on a long peduncle. Internal sensory 

 vesicles. 



Genus Liriope, Lesson, 1843. 

 Generic Character. Geryonidae with four radial canals and with four or eight tentacles. 



Liriope tetraphylla (Chamisso et Eysenhardt), 1820. (PL LIV. fig. 3.) 



Geryonia tetraphylla, Chamisso et Eysenhardt (1820, p. 357, PI. XXVII.). Liriantha tetra- 

 phylla, Haeckel (1879). Liriope tetraphylla, VanhoSen (1902, p. 82, Taf x.). 



