512 MEDUSA OF THE WORLD. 



pedalia. The gonads consist of 8 leaf-like folds attached to the sides of the interradial septa 

 and hanging free in the radial pockets. 



Gelatinous substance of bell is hyaline; entoderm translucent and milky-white; gastric 

 cirri and flexible parts of tentacles pink or yellow-pink; sensory knobs of rhopalia dull ocher 

 in color; ocelli deep brown, almost black. 



This species is by far the largest Carybdea known. 



Found at Fakarava and at Anaa Islands, Paumotos Islands, South Pacific by the Alba- 

 tross in October, 1899. A large swarm upon the surface at Anaa Island. 



This medusa may be identical with the vaguely described Bursarius c \thcrcte Lesson, 

 from New Guinea, or with Tamoya bursaria briefly mentioned by Maas, from the Malay 

 Archipelago. Bigelow, 1909, believes that C. moscri is only the young of this medusa. 



Carybdea alata var. moseri Mayer. 



(?) , SEMPER, 1860, Zeit. fur wisscn. Zool., Bd. 13, p. 561, taf. 39, fig. 9. 



(?) Charybdea philippina, HAECKEL, 1880, Syst. tier Medusen, p. 440. 



Cliar\bdea tnoseri, MAYER, 1906, Bull. U. S. Fish Commission for 1903, vol. 23, part 3, p. 1135, plate I, figs. 2-2C. 



This common Hawaiian Island medusa may be only a small variety, or a young stage, 

 of Carybdea grandts. (See table of synopsis of the species of Carybdea.} It is probably 

 identical with a medusa briefly mentioned and inadequately figured by Semper, from the 

 Philippine Islands. 



Bell 80 mm. high, 47 mm. wide, dome-shaped, with flat top and thin, uniform walls. Each 

 sense-club has 2 large median and 2 small lateral eyes. The sensory niches are long, trans- 

 verse, narrow, and 14 mm. above the velar margin. Pedalia spatula-shaped, flat, expanded, 

 25 mm. long, 17 mm. wide, 24 simple, unbranched, velar canals. Tentacles ringed, tapering 

 throughout their length, hollow, and about 1.5 times as long as bell-height. Gonads not quite 

 as long as the septa on which they are developed. Stomach small, flat, 4 simple lips, gastric 

 cirri simple and unbranched. Honolulu, Hawaiian Islands. 



Carybdea murrayana Haeckel. 



Charybdea murrayana, HAECKEL, 1880, Syst. der Medusen, p. 442; 1881, Report Deep-sea Medusx Challenger Expedition, Zoo]., 

 vol. 4, p. 93, plate 26, figs. i-io. 



Bell 50 mm. wide, 60 mm. high, quadratic below, with flatly dome-like top. Pedalia 

 narrow, tapering, flattened laterally, one-third as long as bell-height. Each sense-club has 

 2 large median and 4 small lateral eyes, as in C. marsuftialis. Velarium wide, with 48 pro- 

 fusely branching, non-anastomosing canals. The 4 clusters of gastric cirri in the interradial 

 corners of stomach are profusely branched, as in C. marsupiahs. 



Off coast of Sierra Leone, west coast of Africa. Depth of 200 fathoms. 



Distinguished from C. marsufaalis by its large number of velar canals. 



Genus TAMOYA F. Miiller, 1859. 



Tamoya, MULLER, F., 1859, Abhandl. Naturf. Ges. Halle, BJ. 5, p. I. AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 174. 

 HAECKEL, 1880, Syst. der Medusen, p. 442. 



The type species is T '. haplonema F. Muller of the Atlantic coasts of North and South 

 America, south of Cape Cod. 



GENERIC CHARACTERS. 



Charybdeidae with 4 simple, interradial tentacles provided with pedalia. Stomach wide 

 and deep; its 4 perradial sides flattened so as to present the superficial appearance of mesen- 

 teries binding the 4-sided oesophagus to the subumbrella. There are 4 vertical, interradial, 

 thread-like or brush-like bands of gastric cirri in the middle of interradial sides of stomach. 



The so-called mesenteries of Haeckel are merely the flattened, perradial sides of the cruci- 

 form stomach. 



Haeckel's Tamoya bursaria and T. gargantna are too imperfectly known to be retained 

 in scientific literature. 



This genus is very closely related to, if not identical with, Carybdea, being distinguished 

 only by its large stomach with its perradial mesenteries and its vertical clusters of gastric cirri. 

 It may eventually prove necessary to unite this genus with Carybdea, for the differences 

 between them are merely of an intergrading character. 



