634 DAVID BRYCE ON FIVE NEW SPECIES OF 



ment carrying along the food particles towards the end farther 

 from the mastax. Arrived near that end, they become incor- 

 porated in a pellet, which is revolved at moderate speed until 

 it is large enough to be expelled into the wide stomach, where 

 its revolving motion ceases. The growth of the pellet at its 

 beginning could not be seen, but perhaps a minute or so after 

 the expulsion of one pellet there could be discerned a tiny mass 

 which, revolving slowly, gradually increased in bulk, the whole 

 process lasting from five to ten minutes if the animal continued 

 feeding steadily. The undulatory movement of the oesophagus 

 seemed to be similar to that frequently observable in the gullet, 

 and less violent than that of the oesophagus in //. sylvestris, and, 

 further, it seemed to cease if no particles of food were being passed 

 along, just as it does in the gullet. 



Like all the foregoing species, Habrotrocha flava, sp. nov., is a 

 dweller in ground moss, although on one occasion I found it in 

 moss which had been growing on a roof, but becoming detached 

 had rolled into the roof gutter. It is a brightly coloured species, 

 for whilst the whole body in the adult is distinctly yellowish, 

 the colour of the stomach deepens almost to a bright rust-red. 

 The corona has a somewhat unusual structure which I later 

 describe in detail, and the many-toothed rami, the stout foot 

 and wide separation of the spurs make this an easily recognisable 

 species. 



A very different habitat is characteristic of Habrotrocha longula 

 sp. nov., which shows a preference for mosses and algae, growing 

 in running water in the more mountainous districts, where it is 

 constantly found in company with Philodina flaviceps Bryce 

 and Philodinavus paradoxus (Murray), which also delight in such 

 situations.* This species has the same habit as H. pavida of 

 taking shelter in any available aggregations of sand or debris. 

 The stomach in adult examples is usually vividly coloured in 

 tints of pinkish red. Its elongate form, short foot, and peg- 

 like spurs, held nearly parallel, seem to show relationship to 



* I have occasionally met with a form nearly related to H. longula, 

 perhaps identical with it, in submerged confervae or mosses growing 

 upon artificially made edges of town ponds and in watercress in a 

 country ditch, but I have not had the opportunity of comparing any 

 of the few examples thus found with my notes or sketches of the form 

 now described. 



