156 W. MILNE ON THE 



of threads or possibly tubes, and are well seen from the side view 

 (fig. 5c). From the front view each has an alveolar appearance 



(fig- 5d). 



There is a curious growth in the neck. 



Murray suggested the name Gallidina faveolata, so I have re- 

 tained it. I have no record of the nature of the toes, but I think 

 it quite possible that it may have to be transferred to the genus 

 Mniobia. 



Habitat. — Rock moss, Euphorbia Kloof, Uitenhage district. 



A fair number were seen in one gathering of moss. I have very 

 often examined moss from the same place, but never had the 

 good fortune to find the animal again. 



Genus HABROTROCHA BRYCE. 



Habrotrocha placida sp. nov. 



PI, 11, figs. 6-6c. 



Specific Characters. — Of moderate length, very narrow and 

 hyaline in colour. Narrow rostrum with double lamella. In- 

 closed wheels characteristic. Antenna very short — about one- 

 third neck width. Teeth about eight, very small. Spurs, short 

 cones without interspace. Corona is equal to two-thirds of the 

 width of collar, and the pedicels are extremely short. Upper lip 

 is bluntly triangular with large elbow-bends directed backward. 

 Trunk is lightly stippled. Size, l/90th inch. 



This species is of a quiet, gentle habit. When placed on the 

 slide, it may not begin feeding for a very long time, but when it 

 does it will remain in the same position for hours, without any 

 swaying movements, but keeping the corona perfectly steady, or 

 shifting the head almost imperceptibly ; when it does creep it 

 does so gently and not with jerky motions. 



The distinctive features are the corona and the upper lip. The 

 corona is to the collar as 4 : 6. Its wheels have scarcely noticeable 

 pedicels, and the primary wreath being thus so near the secondary, 

 the interference due to their vibrations makes it difficult to observe 

 the upper lip. The upper lip is triangular and is raised at a 

 slight angle to the wheels. A short distance from the front each 

 border makes an elbow-bend backwards, and uncovers its base, 

 which is seen as a straight line. The bends can be seen high 

 above the collar when viewed laterally. Sometimes when the 



