MEDUSAE OF THE HAWAIIAN ISLANDS. 
1139 
There are 8 bean-shaped gonads in the subumbrella wall. They are adradial in position, and lie 
about half way between the center and the circular muscle. Each gonad, in a medusa 64 mm. 
in diameter, is 9 mm. long and 5 mm. wide. 
The circular muscle band in the same medusa is a ring of powerful strands 2 mm. wide and 
51 mm. in inside diameter. The whole subumbrella surface is strongly convex, the wing-muscle 
encircling its outer edge. The disk is 9 mm. thick in a medusa 64 mm. wide, its general form being 
that of a double convex lens. 
The arrangement of the peripheral canals of the gastro- vascular space is shown in figure 7, plate ii. 
Simple, straight canals extend radially outward to the sense organs, and to the bases of the tentacles, 
and these are joined by looping vessels that extend into the bases of the lappets. There are no 
fused plates in the radii of the tentacles, such as are described by Maas in Atolla bairdii (1904, Resultats 
Campagnes Scientifiques, etc., Prince de Monaco, fasc. xxvm, p. 51, pi. iv, fig. 34). 
The tentacles appear to increase with the growth of the m.edusa; thus, calling the diameter of the 
medusa the width across the ring muscle of the subumbrella, we find that a medusa 16 mm. in diam- 
eter had 23 tentacles, one of 16.5 mm. had 24, one of 43 mm. had 33, and one of 54.5 mm. had 32. 
Record of Hawaiian specimens. 
Num- 
ber of 
speci- 
mens. 
Date 
Station. 
Geographical position. 
Depth. 
Remarks. 
j 
1902. 
June 17 
do ... 
July 16 
Aug. 12 
4005 
4005 
- 4154 
4177 
Ukula Point, Kauai Island . . . 
do ... 
Fathoms. 
577-480 
577-480 
26-50 
451-319 
Figured specimen ; 32 tentacles. 
8 gonads beginning to appear; 23 tentacles. 
No gonads apparent; 24 tentacles. 
No gonads seen; damaged specimen; 33 tentacles. 
Alia Point Light, Hilo Bay. . . 
Kawahioa Point 
Genus PELAGIA P4ron et Lesueur. 
Pelagia , P6ron et Lesueur, Tableau des Mfiduses, 1809. Haeckel, Syst. der Medusen, p. 504, 1880. 
Generic characters: Pelagidae with 8 adradial tentacles alternating with 8 marginal sense organs; 
16 marginal lappets. 
Pelagia panopyra Peron et Lesueur. 
PI. II, figs. 3, 4. 
Pelagia panopyra P6ron et Lesueur, Tableau des M6duses, p. 349, nr. 64, 1809. Brandt, J. F., Mem. Acad. Imp. des 
Sci. St. Petersbourg, vi e ser.,par. 2, Sci. Nat., tom 2, 4 liv., 1838, p. 382, pi. xiv, fig. 1, pi. xiva, fig. 1-5. Haeckel, 
Syst. der Medusen, p. 509, 1880. 
The disk is 45 mm. wide and about one-half as high as a hemisphere. The aboral, or exumbrella 
surface, is sparsely covered with blunt, wart-like, rounded protuberances. There are 8 hollow tenta- 
cles, each about three-fourths as long as the bell diameter. Eight marginal sense organs alternate with 
the 8 tentacles. There are 16 blunt marginal lappets. The mouth is at the center of the lower surface 
or subumbrella of the disk. It is surrounded by 4 curtain-like palps, which extend downward from 
the 4 radial corners of a throat tube. The throat tube is about 15 mm. long, and the curtain-like palps 
each about 35 mm. long. The central stomach is a flat disk-like cavity, which gives rise to 16 radiating 
pockets, or cavities, which extend outward the tentacles and sense organs. These pouches are 
completely separated one from another by septse, which extend outward to the middle of the lappets. 
Sixteen powerful radial muscles extend outward through these septse, near the subumbrella surface. 
The gonads are 4, complexly folded, outpocketing, in the 4 interradial edges of the stomach. There are 
4 wide, shallow pits in the floor of the subumbrella. These are interradial and extend inward from 
the region of the gonads toward the center of the disk. The tentacles are pink, and the aboral surface 
of the disk is sprinkled with purple pigment. The gonads are deep purplish pink. 
This species appears to be widely distributed over the middle and western parts of the tropical 
Pacific. Three specimens were found by the Albatross among the Hawaiian Islands. 
