100 J. MURRAY 



The animal is strongly pigmented, of the characteristic colour, and is smooth all 

 over, not papillose as in many examples from tropical regions. 



GENUS Diphascon, Plate (23) 

 Diphascon alpinum, Murray (14) (Plate XIV. Fig. 3) 



It has been pointed out by Professor Richters that the southern representative of 

 D. alpinum is not precisely like the type as found on Ben Lawers in Scotland. The 

 Antarctic form has a comma in the pharynx, in addition to the three rods. The 

 comma is not noticed in the original description or figure, but at that time I do not 

 think the comma had begun to be taken notice of as a serious character. 



In the Antarctic examples the three rods do not increase in size so much from 

 first to third as in the type, and the claws appear to be relatively larger and more 

 slender. All these differences do not justify the separation of a new species without 

 fuller study. 



At Cape Royds D. alpinum was much less common than M. arcticus. It was 

 present in a good many of the lakes and ponds, but was never abundant, perhaps 

 most so in Terraced Lake, Cape Barne. 



It was first found in Blue Lake on March 27, 1908, and in that lake, on 

 July 17, a skin with three smooth oval eggs, very probably of this species, was 

 got at a depth of 15 feet, on a thin film of vegetation which covered the stones on 

 the bottom. 



One example measured 200 /j. in length, but that was undoubtedly a small one, 

 though I have no measurements of any larger. The type was 250 /* long, and some 

 examples from the South Orkneys were 360 /x in length. 



At Cape Royds it was never found among moss, but at the Stranded Moraines it 

 did occur. There also three eggs were found in a skin. 



It is now recorded for Spitsbergen and Canada. There are no notes as to 

 the " comma " in these countries. 



Diphascon (?), sp. (Plate XIV. Fig. 4) 



A small animal, of which only one example was found, is referred doubtfully to 

 the genus Diphascon, to which it technically belongs, having a slightly elongated 

 gullet, and claws of the Diphascon type. 



The animal is smooth and hyaline. It measures 300 M in length. The teeth are 

 small, and curved strongly outwards towards the furca. The gullet is of moderate 

 width. It is about twice as long as the teeth. The pharynx is shortly oval 

 and contains two rods in each row of thickenings. The end of the gullet in the 

 pharynx is expanded into a broad flange, to which the apophyses are attached. The 



