80 W. MILNE ON THE 



wider tlian the collar. Sulcus narrow. Upper lip quite distinc- 

 tive. Size, l/90tli inch.. 



This is a vigorous, active animal and feeds freely, and is of a 

 pale hyaline colour. It is of a semi-muscular type, for while the 

 muscular integument is sufficiently strong to keep a fairly regular 

 shape when creeping, yet occasionally the trunk loses its ovoid 

 form when feeding. 



The corona is bold and handsome. It is hardly wider than 

 the collar, has a narrow sulcus and rather high pedicels. It is 

 difficult to get a good view of the upper lip on account of its 

 smoothness and glassy colour, and of the restless habits of the 

 animal. The part of the upper lip which rises up from the flat 

 curve looks somewhat like two stout rose thorns set against each 

 other. The small tooth process in the middle of the curve be- 

 tween is not always seen, and this probably indicates that it is 

 on the sulcus bridge. Lateral flaps are seen at the collar, and 

 there is a large oral entrance with a spout-shaped under lip. 



The rostrum is fairly stout, and the double lamella prominent. 

 The antenna is very short, about one-fourth the neck width, and 

 almost as broad as long. Quite characteristic is the small, square 

 dental bulb, with very broad, thick even outline or borders, and 

 it carries three strong, thick teeth set well apart. 



The rump is not heavy, and the pre-anal segment has a wrinkled 

 mark on each side. The contractile vesicle is very large. The 

 foot is short, and its spurs are sharp and practically not divergent. 

 From tip to tip, the outline is a rather flat concave, but at times 

 the appearance is of two short cones with a short, straight 

 interspace. 



Habitat. — Fairly common in ground moss from Stellenbosch 

 and Mulder's Vlei. 



I have named this species after Mr. J. R. Cuthbert of Stellen- 

 bosch, who kept me supplied with moss from his neighbourhood. 



Macrotrachela macmillani sp. nov. 



PI. 6, figs. 16-16fl. 



Specific Characters. — A plump little animal, of glaucous colour, 

 with a slightly yellowish stomach investment. Each longitu- 

 dinal ridge on the trunk has four deep bends in it ; these deep 

 dents seem to connect crosswise, giving the appearance of five 



