92 D. BRYCE ON FIVE NEW SPECIES OF BDELLOID ROTIFERA. 



some few weeks ago, when it was brought to me by Mr. G. K. 

 Dunstall, who had obtained it from moss collected near Leith 

 Hill, in Surrey. It is probably a more common species than 

 these three isolated records would indicate. It may be that it 

 has a partiality for small tufts of moss (which do not invite 

 examination), or perhaps its restlessness and the absence of any 

 very obvious peculiarity when marching about has led to its 

 being overlooked. 



In view of Murray's opinion that the presence of a ligule in 

 Bdelloids is an unsafe specific character, as it often appears in 

 species where it is not normally present, it must be pointed out 

 that, while it may be presumed that the ligule in Habrotrocha 

 ligula is fairly constant, it is by no means impossible that 

 examples should occur in which it might be absent, and in that 

 case, if normal specimens were not available for comparison, 

 identification might well be difficult. 



Dimensions. Length about 320 fx. Corona 30 /x. Collar 25 /a. 

 Ramus 1 7 /x. Spurs 5 ll. 



Callidina Bilfingeri sp. nov. (PI. 9, fig. 3). 



Specific Characters. Of medium size, and moderately stout, 

 posterior trunk having a series of knob-like prominences. 

 Trochal discs well separated, but corona not exceeding collar 

 width. Upper lip rather high and wide, with shallow central 

 depression. Rami with two teeth each. Dorsal antenna short, 

 about half the neck thickness. Foot three- jointed; first joint 

 laterally swollen, second very short, somewhat distended to form 

 sucker-like disc. Spurs very minute cones, with wide, slightly 

 convex interspace. 



So far as I am aware, this rather well-marked species, of 

 moderately stout build and medium size, has been met with only 

 in ground-mosses. Typical specimens are easily recognised from 

 the series of knob-like prominences which ornament the sides of 

 the trunk segments and the dorsal surface of the rump segments. 



