. 68 W. MILNE ON THE 



ments are nearly of equal length. Very large jaws — l/780tli inch 

 — carry four teeth each ; three are very large and the fourth only 

 just smaller ; the striae are also large. 



A good presentment of a fox's face is given by the brain mass, 

 with its two large eye-spots. The trunk is rectangular — not 

 much longer than broad in the earlier examples found — and 

 has deep and numerous longitudinal furrows. The lumbar region 

 is comparatively light for such a large animal, and has a thick- 

 walled intestine, oval and very long ; and a contractile vesicle 

 which is fairly large. 



The foot consists of four segments, and has spurs which are not 

 unlike those of P. rugosa in shape, but more bent and decurved. 

 Each spur is as long as the width of the ankle ; a straight or 

 scarcely perceptibly convex interspace separates the spurs, and is 

 almost equal to twice the width of the spur base. The spurs 

 seem to be feeble, and in all the earliest specimens one was twisted 

 and not symmetrically placed with the other. Afterwards, the 

 commonest form had the two spurs parallel, the outside border of 

 one convex and the other concave. In one or two of the large 

 examples last seen, the spurs were both convex on the outside 

 borders. 



No great distance separates the toes ; the front ones are thick 

 and fairly long, the back ones thin and short. 



A large and well- developed corona is one-fourth of the length 

 of the fully extended animal, and bears long cilia which play in 

 great waves. In one giant example the corona was l/180th inch 

 wide, but the average width was about l/250th inch. The pro- 

 portions of the corona, collar and neck, are to each other in 

 average specimens as 25, 20 and 15. The upper lip is distinctive. 

 A lobe from the wheel meets the highest point of the upper lip ; 

 and occasionally a tooth jag or two show in the middle notch, but 

 probably belong to the sulcus. A seta rises from a pimple on 

 each wheel. 



It creeps at a fair speed, and sometimes hitches the foot round 

 and forward, with a swing. It feeds freely and usually lies back 

 over the foot when feeding. 



A long tongue-shaped gland lies below the mastax, ventrally. 

 Heavy foot glands run high up into the anal segment. 



Habitat. — Ground moss, the Hatchery, Stellenbosch. Found 

 in fair abundance. 



