174 W. MILNE ON THE 



long setae at right angles to the rostrum, which if present indicate 

 the variety amoenus. 



The upper lip almost curves down for some distance from the 

 collar, then turns quickly upwards with a graceful curve to the 

 fairly broad front, which, when the head is on a level with the 

 body, shows three minute knobs. When the head is raised some- 

 what, a rounded part is seen in front, and also the triple part above 

 and behind it. The upper lip does not lie flat on the corona, but 

 stands up at a considerable angle, so that the rounded part 

 mentioned above may be the under side of the lip raised up and 

 backwards so as to come into view ; or, as I have sometimes 

 thought, there may be two parallel membranes, the front one 

 plain and the back one with the triple top. 



The setae on the middle of the wheels turn outwards, while 

 in 0. regalis they turn inwards. 



The inclosed wheels have a clear-cut border, forming a single 

 oval, with practically no trace of the usual double appearance. 



Habitat. — Kock and tree moss, Uitenhage district and Stellen- 

 bosch. Abundant. 



Otostephanos monteti sp. nov. 

 . PI. U, figs. 21-21a. 



Specific Characters. — Of small size, short, plump and fleshy ; 

 of glaucous colour, with at times a very slight yellowish tinge^ 

 Rostrum short and broad, with prominent double lamella. 

 Antenna very long. Dental bulb elongated, with eight small 

 teeth. Foot of four segments. Spurs, cones of moderate length. 

 Corona equal to collar, shallow, with prominent ring. Sulcus a 

 mere slit ventrally. Upper lip, rectangular with a ligule-like 

 extension on upper border. Size, 1/lOOth inch. 



The two species last described are moss dwellers, but this one 

 inhabits pools. It is a rather slow creeper and has a laborious 

 movement of the foot, but plants it well forward ; it seems to 

 have a difficulty in attaching it to the glass. This animal is 

 most irritating when feeding. As soon as the wheels are out, it 

 begins whirling round and round on a vertical axis, at great 

 speed, and continues this for many minutes at a time, then 

 suddenly with a furious dart it swims clear away. Only once 



