182 ME EDWARD T. BROWNE ON 



umbrella its margin appears to be deeply lobated. Upon the periphery of the ex- 

 umbrella there are sixteen deep radial furrows, in line with the sixteen radial septa 

 which divide the pouches of the stomach. It is along these furrows that the folding 

 takes place, dividing the margin into sixteen broad folds, each of which is again sub- 

 divided by the eight ocular clefts, and by an indentation in the middle of the tentacular 

 lobes. On straightening out the margin of the umbrella all these folds disappear, and 

 one then sees the true lobation of the margin. 



Specimen E. This specimen is the largest in the Scotia collection, and as it is in 

 excellent condition full details are given. 



The umbrella is rather flat, and has probably flattened out in the jar owing to the 

 pliability of the jelly. It measures about 160 mm. in diameter with the marginal 

 lobes folded inwards. For the size of the umbrella the jelly is not very thick. 



The stomach is circular in outline, about 75 mm. in diameter, with sixteen radial 

 pouches. The tentacular pouches are 35-40 mm. in width at their distal margin, and 

 the ocular about 25-30 mm. The circular muscle-bands of the sub-umbrella are upon 

 the lower wall of the pouches, and are separated radially by sixteen furrows which 

 correspond in position to the septa of the gastral pouches. I have not been able to 

 find any radial muscle-bands on the sub-umbrella or the marginal lobes. 



The four oral arms are about 350 mm. in length, and are probably capable of 

 extending to a much greater length. Along the whole length of each arm runs a 

 double frill. These frills are very broad near the mouth and gradually decrease in 

 width towards the distal end of the arms, and give to the arms a long, slender appear- 

 ance. The width of the pillars of the arms is 7-8 mm. across the narrowest part. 



The four gonads are similar in position and shape to those of Cyanea capillata. 

 They hang down in clusters from between the bases of the oral arms, and are much 

 larger than the gonads of the specimen figured by VANHOFFEN. As the medusa lies 

 flat in the dish the gonads extend about half way across the circular muscles. The ova 

 are quite small and immature, so that in a fully ripe condition the gonads should be 

 much larger in size. The genital openings between the oral arms are oval in shape and 

 measure nearly 40 mm. in length. 



There are eight groups of tentacles arranged in a straight single row, adjacent to 

 the outer edge of the circular muscles. The largest tentacles are in the middle of the 

 group and the smallest on either side. They are like long threads with a dark reddish 

 endoderm, and externally covered closely with roundish warts containing nematocysts. 

 The number of tentacles in each group is as follows: 20, 21, 19, 17, 18, 20, 21, 19. 



The eight sense-organs are quite simple in their construction. The tentaculocyst 

 in the early stages lies in a rather broad U-shaped groove, which is partly covered on 

 the sub-umbrella side by the margins of the two ocular lobes. In the adult stage, 

 owing to the increase in the size of the ocular lobes, the groove is longer and is 

 completely covered by the ocular lobes. A canal from the pouch of the stomach runs in 

 the roof of the groove, and at its distal end is situated a small tentaculocyst, about twice 



(HOY. soc. EDIN. TKANS., VOL. XLVI., 246.) 



