THE MEDUSAE OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 249 



inner side and rounded on the ex-umhrellar side. They are about 12 mm. in length 

 and 6 mm. in width, having the outer edge with rounded corners, and are separated 

 from the tentacular lobe by a slight marginal cleft. Along the centre of each ocular 

 lobe runs an unbranched canal. 



The tentacular lobes are about as long as the ocular lobes, and have an undulating 

 margin. These lobes correspond in number and width with the groups of tentacles. 

 Each lobe has a few isolated canals which are in connection with the circular canal. 

 Some of these canals are slightly bifurcated at the distal end. 



This specimen agrees very well with Fewkes' description and figures of Callinema 

 ornata so far as the canal system, sense-organs, tentacles, and marginal lobes are 

 concerned. Phacellophora ornata up till now has only been taken in one locality, 

 namely, at Eastport, on the coast of Maine, U.S., in the North Atlantic. Verrill 

 obtained three specimens, and many years later Fewkes secured another. 



Aurelia solida, Browne. 

 Aurelia solida, Browne, 1905, p. 960, pi. xciv. 



Station 539, lat. 33° 53' N., long. 32° 27' W. Surface. 1st July 1904. 



Four specimens were taken at this station, which is about 15 degrees west of 

 Madeira. Two are in very good condition, and two have a dilapidated umbrellar 

 margin. My original description of Aurelia solida was based upon a single specimen 

 obtained by Mr Stanley Gardiner during his expedition to the Maldive and Laccadive 

 Archipelagoes. I was certainly surprised to find this species from a mid-North Atlantic 

 station in the Scotia collection. The occurrence of this Aurelia in the Indian Ocean 

 and the North Atlantic shows a very wide geographical range, and it is most probable 

 that the species has been taken long ago and recorded under another name. But none 

 of the descriptions and figures of the numerous species of Aurelia show the characters 

 of this medusa. It is certainly not Aurelia aurita, neither can it be regarded as a 

 variety of that species. 



Description. — The umbrella is hemispherical, about twice as broad as high, and 

 thick. The four specimens are about the same size, 55-60 mm. in width, and smaller 

 than the Maldive specimen, which measured 80 mm. in width. The ex-umbrella is 

 covered with small circular clusters of nematocysts. 



The mouth is cross-shaped and formed by four thick, somewhat triangular 

 segments, which are about 20 mm. in length. The four segments are interradial and 

 separated from one another. The mouth has the appearance of a cone-shaped lump of 

 jelly cut longitudinally into four equal segments, and the four pieces placed together 

 again. Along the outer edge of each segment runs a short frill, which at j the base 

 grows out to form the oral arm, which extends a little way beyond the margin of the 

 umbrella. ,., •.- •.- .,.-..-, ...,.,. 



TRANS. ROY. SOC. EDIN., VOL. XLVL, PART II. (NO. 10). 37 



