182 Papers from the Department of Marine Biology. 
Aurellia aurita (Linnzus). 
Medusa aurita, Linnzxvus, 1758, Systema Nature, ed. 10, tomus 1, p. 660. 
Aurellia flavidula, Phron BT LesuruR, 1809 Annal. du Mus. Hist. Nat., Paris, tome p. 14, 369. 
Aurelia aurita, LAMARCK, 1817 Hist. Anim. sans Vert., tome 2, p. 513. 
13 specimens of this universally distributed medusa were found by the 
Albatross among the Philippine Islands. 11 half-grown specimens are from 
station D 5663, December 28, 1909, in Macassar Strait, depth 11 fathoms, 
about 1.7 miles off Kapoposang Island, 7" 20" p.m. 2 larger but still imma- 
ture from Station D 5662, December 21, 1909, Flores Sea, near Tana Keke 
Island, 5" 40™ to 6° 12™ a. m. 
Aurellia labiata Chamisso and Eysenhardt 
Aurelia labiata, CHAMISSO UND EySENHARDT, 1820, Nova Acta Phys. med. Leop. Car., tome 10, 
p. 358, planche 28, figs. 1 A. B—Mayrr, 1910, Medusz of the World, vol. 3, p. 628, fig. 
398.—LieutT, 1914, Philippine Journal of Science, vol. 9, p. 200. 
Light, 1914, records a specimen of this medusa from the Philippines the bell 
of which was 225 mm. in diameter, 107 mm. across the gonads, and with each 
mouth-arm 100 mm. long. 
Aurellia labiata is distinguished from A. aurita by having 16 notches in its 
bell-margin, by its peculiar velum-like, inter-rhopalar, subumbrella mem- 
branes representing the true bell-margin, and by the very small size of its 
subgenital ostia. The mouth-arms are also shorter than one commonly 
observes them to be in A. aurita, and the terminal branches of the radial-canals 
anastomose to a greater degree than in A. aurita. 
The dimensions of three specimens obtained by the United States Fisheries 
Bureau steamer Albatross at Masbate Anchorage, Philippine Islands, on April 
21, 1908, are as follows: 
mm. min. 
mm. 
Diameter of umbrella............ 174 189 128 
Diameter across zone of gonads... 57 53 42 
Length of each mouth-arm....... 74 | 75 52 
Four other specimens were caught at night upon the surface under the 
electric light, at Jolo Anchorage, on February 8, 1908. 
An abnormal but perfect specimen of Awrellia aurita was found at Tortugas, 
Florida, on July 27, 1914. This aberration closely resembled the normal 
A. labiata of the Pacific. There were 16 deep notches in the bell-margin, 8 
perradial and 8 interradial, and the velum-like marginal membrane was like 
that of A. labiata. The small subgenital ostia and simple mouth-arms also 
recalled A. labiata, but the terminal branches of the adradial-canal system 
did not anastomose and in this resembled A. aurita rather than A. labiata. 
The case is interesting, as it leads one to suspect that A. labiata of the Pacific 
has been derived as a mutation from the universally distributed A. aurita. 
The bell of this Tortugas medusa was 270 mm. in diameter. Diameter of 
genital cross 78 mm. Palps simple and each about one-eighth longer than 
the bell-radius. 8 sense organs, 8 interradial notches in the bell-margin. 8 
straight, simple, non-pigmented perradial-canals, 8 straight pink-colored inter- 
radial-canals. The sparingly branched adradial-canals reach the bell-margin 
without anastomosing and in this respect resemble those of A. aurita. The 
male gonads were pink, the tentacles rich purple, the velarium creamy white, 
the palps purple-pink, and the gelatinous substance pink. 
