SOME SCOTTISH ROTIFERS 163 



agreed so well with the new conditions that they increased 

 prodigiously and abounded in the saucers for months. To 

 obtain those living in the pitchers of Frullania, I found it 

 necessary to immerse the moss in water and examine it 

 very shortly after, as the Rotifers very quickly died when 

 kept constantly in still water, notwithstanding the extra- 

 ordinary power these species possess of withstanding alternate 

 moistening and dessication. Those from hepatics growing 

 in constantly running or dripping water, as at waterfalls, 

 require also to be examined immediately, as they soon die 

 in still water. 



A number of species, such as Callidina quadricornifera 

 and C. scarlatina, were found both in the hoods of Frullania 

 and the leaves of Sphagnum ; while one species, PJiilodina 

 rugosa (Bryce MS.), was first observed among Sphagnum, 

 then with hepatics from dripping rocks, and lastly, in the 

 open water of a deep loch. 



BDELLOIDA. 



Some 40 species of this Order were observed during 

 the winter months from December 1901 to March 1902, 

 1 7 of which belonged to the genus Callidina, 1 3 to Philo- 

 dina, J to Rotifer, and 3 to Adineta, while several of them 

 have not yet been named. A number of the species are 

 believed to be hitherto undescribed or not previously recorded 

 for Britain. These are dealt with in the present contribution. 



I must here express my indebtedness to Mr. David 

 Bryce, who has made such valuable contributions to our 

 knowledge of this Order. He most cordially assisted me 

 by looking over my drawings and notes. Without the 

 advantage of his thorough knowledge of the Order, and of 

 the literature dealing with it, I could not have decided 

 whether the animals observed had been previously described 

 or not. 



In the drawings of Bdelloida accompanying these notes 

 the cilia of the wreaths are only shown as they appear in a 

 general view, no attempt being made to indicate all their 

 details, as in most instances the animals did not afford 

 sufficient opportunity for the full study of the wreaths ; 



