576 MEDUS/E OF THE WORLD. 



form can not be distinguished from P. placenta for I have found specimens which intergrade 

 in one character or another. Many specimens of this medusa were found by the Albatross in 

 the Philippine Islands in March and April, 1908. The dimensions in mm. of a mature speci- 

 men are as follows: Diameter of bell, 35; height of bell, 15; length of oesophagus, 14; length 

 ot lips, 30; length of tentacles, 50. 



The largest exumbrella warts are near the center of the bell and they decrease in size 

 toward the margin, where they are very small. The surface of these warts is nodular and 

 lacks the cross-foldings seen in the typical P. panopyra, but this character mtergrades. 



Pelagia flaveola Eschscholtz. 



Pelagia faveola, ESCHSCHOLTZ, 1829, Syst. der Acal., p. 76, taf. 6, fig. 3. GOETTE, 1886, Sitzungsber. Akad. Wissen. Berlin, 



Jahrg. 1886, p. 883. 



( ?) Pelagia denticulata, BRANDT, J. F., 1838, Mem. Acad. Sci. St. Petersbourg, Sci. Nat., ser. 6, tome 4, p. 383, taf. 14, fig. 2. 

 Pelagia tahitiana, AGASSIZ, A., AND MAYER, 1901, Mem. Museum Comp. Zool. at Harvard College, vol. 26, p. 158, plate 8, figs. 



.34.35- 

 Pelagia papillata, HAECKEL, 1880, loc.cii., p. 509. 



For description see synoptic table of forms of Pelagia, and figure 364. 

 This form is distinguished by its yellow color and long, pointed nettle-warts which cluster 

 thickly at the aboral apex of the bell. Tropical Pacific from South America to East Africa. 



Pelagia perla Haeckel. 



Medusa perla, SLABBER, 1781, Physikal. Belust., p. 58, taf. 13, fign. i, 2. 



Pelagia cyanella, FORBES, 1847, Annals and Mag. Nat. Hist., vol. 19, p. 390, plate 9, fig. 5. 



Pelagia perla, HAECKEL, 1880, Syst. der Medusen, p. 506. MAAS, 1904, Result Camp. Sci. Prince de Monaco, fasc. 28, p. 57. 



DF.LAP, M.S., 1906, Fisheries of Ireland, Sci. Invert., 1 905, No. 7, p. 22, I plate. VANHOFFF.N, 1906, Nordisches Plankton, 



Nr. 11, p. 45, fign. 6, 7. BROWNE, 1908, Trans. Royal Soc. Edinburgh, vol. 46, p. 242. 

 Pelagia discoidea, ESCHSCHOLTZ, 1829, Syst. der Acal., p. 76, taf. 7, fig. i. 



This appears to be a North Atlantic variety of P. cyanflla. The nettle-warts of the 

 exumbrella are more numerous and the outer margin of the lappets are concave instead of 

 convex as in P. cvanella. For description see the synoptic table of the forms of Pelagia. 



P. discoidea from the Cape of Good Hope is probably identical with /*. perln. 



Pelagia phosphora Haeckel. 



Pelagia phosphora, HAECKEL, 1880, Syst. der Medusen, p. 506. VANHOFFEN, 1888, Bibliotheca Zoologica, Bd. i, Heft. 3, pp. 1 1, 

 22, taf. 6, fign. 18, 19; 1892, Ergeb. der Plankton Expedition, Bd. 2, K. d., p. 19; 1902, Wissen. Ergeb. deutsch.Tiefsee 

 Expedition, Valdivia, Bd. 3, Lfg. I, p. 36. 



This form is closely related to P. cyanella, but may possibly be distinguished from it by 

 the larger nettling-warts upon the exumbrella, which are round and 0.5 to I mm. in diame- 

 ter and each gives rise to a longitudinal comb-like crest. Marginal lappets wider than long. 

 (Esophagus about one-fouith as long as bell-diameter, mouth-arms about equal to bell-diam- 

 eter in length. Bell hemispherical, 40 to 50 mm. in diameter. Color quite variable, either 

 purple, violet, or reddish; gonads, tentacles, and median ribs ot the mouth-arms of darker 

 color than other parts of the animal. 



Found in the eastern Atlantic from 58 N. to 42 S. lat.; also in the Indian Ocean, 

 being especially abundant in the tropics. 



Vanhoffen, 1902, gives the following dimensions for this species: Diameter of bell, 76 

 mm.; height of bell, 25 mm.; tentacles, 76 mm. long; nettling-warts on exumbrella, 2.5 

 mm. high. 



Pelagia "miniita" Vanhoffen, 1888 (Bibliotheca Zoologica", Heft. 3, p. 12, taf. 6, fign. 

 16, 17), is a variety of, or possibly the young of, P. phosphora. The nettling-warts on the 

 exumbrella, in specimens preserved in alcohol, are elongate with numerous transverse furrows 

 (due to contraction ?). No mature specimens were described by Vanhoffen. Found at 

 Pernambuco, Brazil, early in July. 



Pelagia crassa Vanhoffen. 



Pelagia crassa, VANHOFFEN, 1888, Bibliotheca Zoologica, Bd. i, Heft. 3, pp. 10, 22, taf. I, fign. I, 2; taf. 6, fign. 13, 14. 

 Pelagia crassa var. sublaevis, Ibid., p. II, taf. 6, fig. 15. 



This appears to be a small variety of P. noctiluca. 



Bell about 13 mm. high and about 35 mm. in diameter. Gelatinous substance of exum- 

 brella thicker than in any other Pelagia. Marginal lappets about twice as wide as long. 



