62 W. MILNE ON THE 



realise all its intricacies takes a prolonged inspection, aided by 

 a good deal of luck in getting tlie animal to turn its wheels in 

 particular directions, so that views may be bad under the great 

 cilia wbicb lasb down into the sulcus, especially just under the 

 dorsal termini of the primary and secondary wreaths. When the 

 head is in the usual position it is practically impossible to see the 

 corners under these termini. 



The secondary wreath is well developed, and passes round, 

 laterally, on a considerable projection which is continued lower 

 down towards the neck. The lower boundary of the latter pro- 

 jection continues round dorsally (still standing out) to the sulcus 

 in a wavy curve, and just under the end of the secondary wreath, 

 bends down and round in a tongue-like part (PL 3, fig. 3^), and is 

 continued in a large scalloped curve s round and up to near the 

 corner of the upper lip. All round the lower rim of this projec- 

 tion, the tongue part, and the scalloped curve, is a narrow, 

 glaucous, fleshy-looking band. This cannot be considered part 

 of the upper lip, I think, as it does not start from what is usually 

 considered the collar. Just below the lateral projection is the 

 collar, and from it there proceeds a band r (placed lower in the 

 figure than its real position to show more clearly), usually shadowed 

 or covered by the projection above. When the wheel is screwed 

 up and forward, the band can be traced up to the middle of the 

 tongue part t already mentioned. There it seems to stop, but 

 as it looks to be at a lower level, it evidently passes under. From 

 the front corner of the upper lip there passes back a thin fleshy 

 border — highest in the middle — down close to the other side of the 

 tongue part. This is apparently continuous with the band already 

 traced to the under side, but a good view is very rarely had 

 owing to the play of the coronal cilia, and even at the best is not 

 quite free of interference. This band, then, which apparently 

 passes under the tongue part, is evidently the border of the 

 upper lip, whose front margin is nearly as wide as the sulcus, and 

 practically straight. 



There is another line which starts from the collar alongside the 

 first, and half-way towards the sulcus begins to widen out into a 

 broad band u, which passes close to, and is often in contact with, 

 the tongue part, and then bends across immediately in front of 

 the rostrum. This band does not seem to lie flat, but is raised a 

 little anteriorly. 



