BROWNE— MEDUSA FROM THE INDIAN OCEAN 205 



down at right-angles to the main central ridge. A roundish wart has ridges and furrows 

 radiating out from the centre. 



The specimens are from 20 to 25 mm. in diameter; the largest measured 25 mm. in 

 width and 15 mm. in height. The umbrella is hemispherical in shape with a slightly 

 flattened top, and moderately thick. 



The marginal lappets are about as long as broad, with rounded corners. They are 

 thin and partly covered with small roundish or oval patches of nematocysts. The oral 

 arms are rather contracted, and have a firm solid appearance, about 15 mm. in length. 

 The manubrium, oral arms, and frills, are covered with warts, usually oval in shape, but 

 more variable in shape and size on the frills. On the margin of the umbrella, opposite 

 every sense organ, there is a small shallow conical pit. The largest specimen has ova in 

 the genital sacs. 



46. Pelagia sp. ?. A. 



Locality. South of Saya de Malha, Surface. 4 Sept. 1905, m. 1 specimen. 



One specimen found amongst those of Pelagia jlaveola by the shape of its warts 

 clearly belongs to another species. It has a number of long and oval-shaped warts upon 

 the ex-umbrella, which is in an excellent state of preservation and completely covered with 

 ectoderm. The warts are very variable in shape and size, some are roundish. On the top 

 of the warts there is a patch of nematocysts corresponding to the general shape of the 

 raised warts. There are no clear indications of ridges and furrows in these warts. I am 

 rather inclined to think that the appearance of ridges and furrows on the surface of the 

 warts, which have been denuded of ectoderm, has some connection with a shrinkage of 

 the jelly, and that they probably -would not be noticed if the warts were completely covered 

 with ectoderm. 



The specimen measures about I'l mm. in diameter. The marginal lappets are loosely 

 covered with small roundish or oval warts, which are confined to the areas occupied by the 

 canals on the lappets. A shallow, roundish pit exists on the margin of the ex-umbrella, 

 opposite each sense organ. This single specimen comes nearest to Pelagia pano2Dyra on 

 account of the presence of the oval-shaped warts. 



47. Pelagia elaveola, Eschscholtz, 1829. 



Pelagia Jlaveola, Eschscholtz, 1829, p. 76, Taf. 6, fig. 3. 



Pelagia papillata, Haeckel, 1880, p. 509. 



Pelagia tahitiana, Agassiz and Mayer, 1902, p. 158, pi. 8, figs. 34 — 35. 



Pelagia Jlaveola, Mayer, 1910, p. 575, text-fig. 364. 



Locality. South of Saya de Malha, Surface. 4 Sept. 1905, m. 24 specunens. 



The specimens of Pelagia taken at this station can easily be distinguished from those 

 taken at the other stations by the shape of the warts upon the ex-umbrella. The warts 

 are formed of conical lumps of jelly capped with a small cluster of nematocysts, and they 

 stand up conspicuously as figured by Agassiz and Mayer (1902, PI. 8, fig. 34) for Pelagia 

 tahitiana. The largest warts are upon the upper half of the umbrella and they decrease 



