178 Papers from the Department of Marine Biology. 
Atolla bairdii forma valdivie Vanhoffen. 
Atolla valdivie, VANHOFFEN, 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer Valdivia, 
Bd. 3, Lief. 1, p. 13, Taf. 1, Fig. 3; Taf. 6, Fign. 41-46.—Maas, 1903, Seyphomedusen der 
Siboga Expedition, Monog. 11, p. 17, Taf. 1, Fign. 3, 4; Taf. 3, Fig. 23; Taf. 12, Fig. 108.— 
Mayer, 1910, Meduse of the World, vol. 3, p. 565, fig. 358. 
This form is very closely related to A. bairdii but the central disk is only 
half as wide as the medusa, and the 4 septal nodes are wider than in A. bairdii. 
The Albatross obtained three specimens of this medusa in the Philippine 
Islands on April 10, 1908, at dredging station No. 5202, in Sogod Bay, depth 
502 fathoms, bottom green mud. The characters and dimensions of these 
specimens are given in Mayer’s “‘ Meduse of the World,” vol. 3, p. 565. 
Genus PELAGIA Péron and Lesueur, 1809. 
Pelagia, Péron ev Lesvevr, 1809. Annal. du Mus. Hist. Nat. Paris, tome 14, p. 349. 
GENERIC CHARACTERS. 
Semzostomata of the family Pelagide, in which the central stomach gives 
rise to 16 completely separated radiating pouches, 8 in the radii of the tentacles 
and 8 in the radii of the sense-organs. There are 8 adradial tentacles, 8 
rhopalia, and 16 partially cleft marginal lappets. Each of the 16 stomach 
pouches is cleft at its distal end, where it enters the marginal lappets. There 
is no ring-canal. 
Pelagia panopyra Péron and Lesueur. 
Pelagia panopyra, PGRoN Et LESUEUR, 1807, Voyage aux terres Australes, planche 31, fig. 2. 
This widely distributed tropical Pacific species is distinguished by its small, 
low, rounded exumbrella warts, which are elliptical in outline and have a 
longitudinal furrow with cross-foldings. The bell becomes about 50 mm. wide, 
and the cesophagus is about as long as the bell-diameter, the mouth-arms 
being somewhat longer. In common with the species of Pelagia, the color 
is highly variable, but the bell is usually rose-colored or violet, and the nettling- 
warts are violet. The gonads are usually purple and the mouth-arms violet. 
There are 21 specimens of this medusa in the collection of the Albatross in 
the Philippines; 10 are from Station 5422, March 30, 1909, from a tow made at 
a depth of 15 feet below the surface, about 10 miles off Lusaran Point Light, 
between Panay and Guimaras; the largest specimen is 33 mm. wide and with 
large gonads, while another 28 mm. wide has only small gonads. 11 young 
specimens were obtained at Station D5220, April 24, 1908, on the surface 
between Luzon and Marinduque at 12'57™ p.m. These are all small and 
about 10 mm. in diameter, evidently being taken from a swarm of immature 
individuals. 
Genus CHRYSAORA Péron and Lesueur, 1809. 
Chrysaora, PhRoN ET LESuEUR, 1809, Annal du Mus. Hist. Nat., Paris, tome 14, p. 364. 
GENERIC CHARACTERS. 
Pelagide with 8 marginal sense-organs, 38 tentacles, and typically 4X8 
marginal lappets; although in C. melanaster the lobes may still further divide, 
giving 68 marginal lappets. 
