REPORT ON THE DEEP-SEA MEDUSAE. 15 



and. Cavmai ina among the Caxmarinidse). The sucking-tentacles beset the whole um- 

 brella margin, closely crowded in several rows over each other, as in Pectyllis, not in 

 separate bunches as in Pectanihis. The radial mesogonia are much less strongly de- 

 veloped than in the two other genera. The structure of the oesophagus, with its eight 

 curious adradial, ectodermal, oral funnel cavities, and the eight pair of endodermal side 

 pouches alternating with them, is quite peculiar, and, as far as I know, does not exist in 

 any other Craspedota. 



Pedis antarctica, Hseckel (Pis. V., VI.). 



Pedis antarctica, Hreckel, 1879, System tier Medusen, p. 2G6, No. 288. 



Umbrella almost hemispherical ; about 1^ times as broad as high. Exumbrella 

 finely radially ribbed, with thirty-two more prominent ribs towards the margin. 

 Stomach quadrangularly prismatic, nearly as long as the radius of the umbrella. Oral 

 cavity with eight pairs of hemispherical side pouches. Oral margin fleshy and thickened, 

 quadrate, with four radial oral tentacles. Eight genitalia, egg-shaped sacs having 

 folds, in the proximal half of the radial canals, connected with the base of the stomach by 

 eight narrow radial mesogonia. 11 to 13 blind radial canals (3 larger and 8 to 10 smaller) 

 between each two radial canals. Umbrella margin, thickened into a roll ; thickly beset 

 with numerous rows of sucking-cups (about a thousand), forming thirty-two connected 

 groups. Between these numerous (8 to 16 ?) free auditory clubs. Horizontal diameter of 

 the umbrella, 36 mm. ; vertical diameter, 24 mm. 



Habitat. — Antarctic portion of the Indian Ocean, S.S.E. from Kerguelen Island. 

 Lat. 60° 52' S., long. 80° 20' E. Depth, 1260 fathoms. Station 152. 11th February 

 1874. From this habitat I had only one single specimen for examination, but it was 

 complete and well preserved. 



The umbrella showed, in a perfectly uninjured state, the peculiar natural shape 

 represented in figs. 1 and 2, Plate V.; fig. 11, Plate VI. A deep exumbral circular 

 furrow runs externally round the umbrella, about half-way up its height, dividing it into 

 an upper, nearly hemispherical, umbrella cone, and a lower, shallow, funnel-shaped, 

 umbrella margin. The largest transverse diameter of the umbrella (at the opening of the 

 umbrella-cavity) amounted to 36-40 mm., and was nearly double that of the largest 

 vertical diameter (in the axis of the umbrella). 



The exumbrella (or the external, convex surface of the umbrella) is traversed 

 throughout by a very large number of fine radial ribs, amounting in the periphery of the 

 umbrella to 500 to 600 (PI. V. fig. 1 ; PI. VI. fig. 20). Besides these there are also 

 thirty-two more prominent radial ribs, running the whole length, and thirty-two less 

 prominent " costse exumbrales " (fig. 20, cs) alternating with them. 



The gelatinous substance of the umbrella (fig. 2, ug) is nearly of equal thickness in 

 the upper aboral half of the umbrella, and nearly as thick on the radial section as the 



