176 MR EDWARD T. BROWNE ON 



The margin of the umbrella of Botrynema is divided into sixteen small lobes which 

 are separated by furrows. There are eight percanal furrows, in which are situated the 

 solitary tentacles, and eight inter-canal furrows, smaller in size and without tentacles. 

 Upon each of the sixteen lobes are attached the basal ends of a group of tentacles, 

 about twelve in number, arranged in a single row and in a definite order of growth. The 

 basal ends of the tentacles vary in length and in size, indicating that the tentacles are 

 of different lengths, which is no doubt due to differences in age. In fig. 1 the longest 

 basal ends are nearest to the percanal tentacle, but in some of the other groups the 

 shortest basal end occupies this position. It was in only one of the intervals between 

 the groups of tentacles that very minute basal ends of tentacles were seen. They are 

 indicated in the figure, and are evidently of much later growth than the tentacles on 

 the lobes. Gossea vorynetes (Petasidae) has eight distinct groups of tentacles, and in 

 the fully grown adult a few minute tentacles make their appearance, long after the 

 other tentacles, in the vacant space between the groups. 



The margin of the umbrella was carefully searched over for sense-organs, and 

 none were seen ; but the margin is by no means in good condition, so that the 

 absence of sense-organs is not surprising. The specimen is in formalin, and the 

 colour of the principal organs is whitish. There is no trace of any red or reddish-brown 

 pigment. 



I have much pleasure in naming this species after Dr WILLIAM S. BRUCE, the leader 

 of the Scottish National Antarctic Expedition. 



SCYPHOMEDUS^J. 



CORONATA. 

 Family ATOLLID.E. 



Atolla chuni, Vanhb'ffen, 1902. 

 Atolla chuni, Vanhoffen, 1902, p. 12, Taf. i. fig. 1-2, Taf. v. fig. 26. 



Station 450, lat. 48 S., long. 9 50' W. Trawl, 1332 fathoms. 12th April 1904. 



The collection contains one specimen, which evidently got damaged in the trawl. 

 The mouth, stomach, and gonads are partly torn away, but the margin of the umbrella 

 is in fairly good condition. 



This species was first found by the Valdima expedition, and has been beautifully 

 figured by VANHOFFEN. Two specimens were taken by the Valdivia between the 

 Cape of Good Hope and Bouvet Island (lat. 42 S., long. 14 E.) in a vertical 

 net at 1500 metres (821 fathoms), in the Antarctic current with a temperature 

 ofO-8C. 



Atolla chuni is distinguished from the other species of the genus by the presence 



(ROY. soc. EDIN. TRANS., VOL. XLVI., 240.) 



