172 MR EDWARD T. BROWNE ON 



Between every large and small tentacle there is generally a long cordylus, commonly 

 called a sensory club (figs. 2 and 3). On the inner side of the basal bulbs of the 

 large tentacles, and very close to the velum, there is usually one black ocellus, but 

 it is frequently broken up into two or three smaller pigment spots. 



LINKO has found in Staurophora arctica minute ectodermal sensory vesicles, which 

 are situated above the velum at its juncture with the umbrella. I have searched for 

 sensory vesicles in this specimen, and have failed to find the slightest trace of one. 

 Transverse sections of the umbrellar margin show a small cavity in the ectoderm in the 

 same position as LINKO'S sensory vesicles. This cavity, however, runs through a series 

 of over three hundred thick sections, so that it is not likely to be a sense-organ with 

 otoliths, but it looks more like a breakage in the ectodermal layer. 



Staurophora falklandica bears a strong resemblance to S. laciniata, L. Agassiz, 

 which is found in the North Atlantic, on the coasts of North America and North 

 Europe. The latter species has alternating series of long and short tentacles, but the 

 difference in size is very slight, and both series have ocelli. In the Falkland specimen 

 there is a considerable difference in the size between the two kinds of tentacles (fig. 4). 

 The very small ones are all about the same size and are without ocelli. They have the 

 appearance of rudimentary tentacles. It is rather a risky point, I admit, on which to 

 base the character of a new species, as there is the probability of the small tentacles 

 developing into full-sized tentacles with ocelli. 



Family EUCOPID.E. 

 Phialidium simplex, Browne, 1902. 



Phialidium simplex, Browne, 1902, p. 282. 



Station. Stanley Harbour, Falkland Islands, 7th January 1903. 

 A single adult specimen in bad condition of this species was found in the bottle 

 containing Desmonema chierchiana. 



It was one of the new species in Mr VALLENTIN'S collection from Stanley Harbour. 



TRACHOMEDUS^E. 



Family HALICREIDJE, Fewkes, 1882. 



Vanhdffen, 1902; Maas, 1906. 



Character of Family (MAAS, 1906). Trachomedusse with numerous tentacles 

 differing in size, arranged in a single row ; with eight very broad radial canals ; with a 

 thick umbrella often provided with outgrowths (with a wide, thin-walled tubular 

 stomach). 



(ROY. soc. EDIN. TRANS., VOL, xi.vi., 236.) 



