116 THE MEDUSAE. 



ietraphijlla by the narrow, oval form and distal position of the gonads, and 

 by the narrowness of the radial canals. In all the specimens, moreover, the 

 gelatinous substance is thinner and softer than in L. tetraphylla, but whether 

 this can be considered a specific character is doubtful. 



Geryonia Peron et Lesueur, 1809. 



Geryonidae with six radial canals. 



Like the collections of most of the previous deep-sea expeditions, that of 

 the " Albatross " contains very few specimens of this genus compared to the 

 vast numbers of Liriope, — a fact interesting because the two genera are 

 now known to be of parallel distribution in the warmer waters of all oceans. 

 I follow Vanhoffen (: 02'') in referring the present specimens to the oldest 

 species, G. proboscidalis Forskal. Probably, as he suggests, the number of 

 centripetal canals per sextant will prove to be an important specific char- 

 acter, in which case G. umhella Haeckel with nine, and G. giltschii Haeckel 

 with eleven, must be distinguished from G. probomdalis with seven. But 

 whether G. umbella and G. giltschii represent two good species, or only a single 

 one, cannot be determined without an examination of extensive material. 

 It is certain that the slight differences in form, size, shape of the gonads, and 

 color, which have been used as the bases of specific distinctions in this genus, 

 merely indicate different stages in growth. 



Geryonia proboscidalis Forskal. 



Medusa proboscidalis Forskal, 1776, p. 108, taf . 36, fig. 1. 



Geryouia proboscidabs Eschscholtz, '29, p. 88; Haeckel, '79, p. 295; Vaahoffen, : 02'', p. 85. 



Dianaea proboscidalis Lamarck, '16, p. 505. 



Liriope proboscidalis Lesson, '43, p. 331. 



Leuckartia proboscidalis L. Agassiz, '62, p. 364. 



Leuckartia brevicirrata Haeckel, '64'', p. 462. 



Geryonia hexaphylla Brandt, '38, p. 389, taf. 18, 



Carmarina hezapbylla Haeckel, '79, p. 298. 



Geryonia conoides Haeckel, '64'', p. 466. 



Geryonia fungiformis Haeckel, '64*^, p. 465. 



Carmarina fungiformis Haeckel, '79, p. 297. 



Geryonia umbella Haeckel, '64'', p. 464. 



Geryonia hastata Haeckel, '64', p. 327. 



Carmarina hastata Haeckel, '79, p. 297. 



Geryones elephas Haeckel, '79, p. 294, taf. 18, fig. 7. 



? Dianaea endrachtensis [-gaberti] Quoy et Gaimard, '24, p. 566, pi. 84, fig. 2. 



? Dianaea gaberti Blainville, '34, p. 289, pi. 34, fig. 2. 



? Eirene endrachtensis Eselischoltz, '29, p. 94. 



? Orythia viridis L. Agassiz, '62, p. 363. 



? Geryonia dianaea Haeckel, '79, p. 295. 



