58 W. MILNE ON THE 



different and each has a very short antenna. D. carnosus has a 

 wider spread of corona, a more opaque integument, and is more 

 massive, more especially towards the rump. It has four segments 

 in the foot, while M. tetraodon has three as stated by Janson. The 

 bases of the spurs in M. tetraodon are not globose but irregularly 

 swollen, seen best ventrally towards the middle, and are relatively 

 smaller. The spurs of M. tetraodon are curved and longer. In 

 D. carnosus the two toes are distinct (fig. 2c) ; in M. tetraodon there 

 is but a suggestion of two toes, caused by a slight pinch on one 

 side, but the two parts on either side of this pinch never alter their 

 relative positions towards each other, Avhen exserted, which they 

 would do if there were two toes. D. carnosus is of a much 

 livelier disposition. M. tetraodon would seem to be a divergence 

 from D. carnosus or some common ancestor. 



Habitat. — Ground moss found growing very sparsely in grass 

 at Springfield near the river, Uitenhage district. It was exposed 

 to the broiling sun, and subject to long droughts. Very rare. 



Genus PHILODINA (Ehr.). 

 Philodina praelonga sp. nov. 

 PI. 4, figs. 5-56. 



Specific Characters. — Of a fairly deep yellow colour, tinged with 

 red in the alimentary tract. Long and narrow ; the rump and 

 foot taper gradually from the end of the trunk, which is almost 

 uniform in width. Corona is very wide relative to the body ; 

 about one-half wider than the collar, and more than one-fourth 

 of the animal when creeping. Antenna is equal to nearly three- 

 fourths neck width. Two lemon-coloured eye-spots on a small 

 brain mass. Jaws not large, squarish ; teeth, three large and one 

 small. Foot has four segments. Spurs short, practically parallel, 

 with short, straight interspace. Toes, four ; two front ones stout 

 and long, the other two quite small. Size, l/50th inch. 



This is a long, narrow animal which does not broaden out any- 

 where when creeping, and very little when feeding. It creeps 

 with a sort of dead pull and progresses rather slowly. It swims 

 very freely, as might be expected, seeing its home is in pools. The 

 corona is most elegant and attractive, and is very wide-spreading. 

 Corona, collar and neck are to each other as 35, 25 and 15, and 

 in some cases the corona is as much as oae-half wider than the 



