BDELLOID ROTIFERA OF SOUTH AFRICA. 159 



very short, of three segments. Spurs fairly long, almost parallel. 

 Corona one-half wider than collar. Oral entrance has a great pro- 

 jecting spout form. Upper lip very distinctive. Size, l/80thinch. 



This is probably a tube builder, but none was ever seen in a 

 case. The older specimens were very sluggish and hardly ever 

 moved from the place where they were first seen. They are far 

 from being of the 7nusculosa-tyi^e, as the trunk runs and streams 

 into all shapes when feeding. At first I decided it was a Mniobia. 

 In the first example observed the foot was planted against 

 the cover-glass and the spur segment was seen to have a slight 

 expansion at the end (PL 11, fig. 8c). There seemed to be clusters, 

 two or three, of very fine muscular sucker-like threads from the 

 end and no sign of toes. Later, however, a young specimen was 

 observed creeping against the cover-glass, and showed toes very 

 distinctly, two well spread out, and evidently a smaller one though 

 not well distinguished. It progressed at rather a slow rate, with 

 a rasping dead pull. The pre-intestinal part appeared fully as 

 long as the rest of the body. 



The rostrum is somewhat of the nature and appearance of that 

 of Rotifer longirostris. It is as long as the width of the neck, 

 and is very narrow and of practically uniform width. The joint 

 in the middle is very distinct. In the older specimens when 

 attached, the rostrum has generally an empty appearance, and 

 the sheath is peculiarly mica-like. The skin of the neck occasion- 

 ally has this wrinkled mica appearance ; when young the neck 

 is fleshy, and the rostrum lacks much of this appearance. The 

 young was seen to bend the rostrum at right angles to the body, 

 and to twist it about easily, as if it were fitted into a socket. 

 The lamella is single and spoon-shaped. The inclosed wheels 

 are elongated. The antenna is very long — one and one-fourth 

 times the neck width — and it is very narrow from the joint to 

 the end ; and has a stout bunch of setae in the middle of the 

 extremity. 



The antennal segment is longer than usual. Behind the 

 antenna, and not alongside, are two peg-like projections, ap- 

 parently cone-shaped in one view, and triangular in another. 

 They rise direct from the segment with no ridges or connection 

 between them. H. amfulla has similar prominences. The jaws 

 are long and rather narrow, and bear three teeth on each side,, 

 fairly large and uniform in size. 



