474 Mr. E. T. Browne on the MeJusce 



Ireland and Iceland, lat. 59° V N., long. 13° 32' W., lat. 

 42° 8' N., long. 63° 39' W. {Hcechel). 



Ptychogena antarctica, sp. n. 



This new species was taken off Cape Adare, Victoria Land, 

 by the ' Soutiiern Cross ' Expedition. There is only one 

 specimen, which unfortunately has a large hole through the 

 top of the umbrella. The stomach and mouth are completely 

 f(one and only the distal halves of the four gonads remain. 

 The margin of the umbrella is in perfect condition. The 

 basal bulbs of the tentacles are laterally compressed, and 

 there are no ocelli. They belong to the same type of bulb as 

 that figured by Agassiz and Hajckel for P. lactea^ and are not 

 like the basal bulbs of Staurophora or Laodice. 



The gonads are large, with broad lateral folds. In the 

 region of the gonads the radial canals show a wavy margin 

 corresponding to tlie principal folds of the gonads, but 

 the canals have no lateral diverticula like P. lactea. Tlie 

 sha})e of the gonads is intermediate between P. lactea and 

 P. longigona. 



The new species can easily be distinguished from P. lactea 

 by the absence of diverticula on the radial canals and by the 

 colour of the tentacles, wiiich are red. It is not so easy to 

 distinguish it from P. longigona, because the organs on the 

 margin of the umbrella of P. longigona have not been 

 described in detail or figured. The gonads of the P. ant- 

 arctica have much broader lateral folds and do not extend so 

 far along the radial canals. 



A description with figures of P. antarctica will appear in 

 the Keport on the ]\ledus{e collected by the ' Discovery' and 

 * Southern Cross ' Expeditions. 



Ptychogena longigona, Maas, 1893, p. 64, Taf. vi. figs. 7-9. 



Maas, in the description of this species, states that it has 

 " Eandkolben," by which I presume he means cordyli. As 

 he has omitted to figure the margin of the umbrella, it is 

 necessary to rely upon the brief description. The gonads are 

 very loug, extending the whole length of the radial canals, 

 and are arranged in a series of lateral folds or lobes, but the 

 radial canals have no lateral diverticula as in P. lactea. 



Distribution. North Atlantic, off the north-west coast of 

 Scotland, 



