82 W. MILNE ON THE 



The corona is bold, and lias a sulcus rather wider than half 

 the disc, and the proportions of the corona, collar and neck are 

 to each other as 10, 9, 7. 



The upper lip rises above the sulcus bridge, has a broad 

 front, with rounded corners and a shallow indentation in the 

 middle. There is a thick, short, fleshy tooth in the sulcus. 



The trunk is stippled. 



The egg is broadly oval, with round knobs somewhat like those 

 in P. flena, but more numerous — about fourteen. 



Habitat. — Eock moss, Grahamstown. On the first occasion 

 when I found this species I saw only some three or four, and put 

 my notes aside, lest it should prove a freakish or unstable variant ; 

 but on a second occasion it was found in great numbers, and 

 frequently as many as a dozen were seen on a slide. It does not 

 seem, however, to be widespread, as out of the large number of 

 pieces of moss examined only one small piece on each of the two 

 occasions contained any. 



Professor Macmillan, Grahamstown, sent me the moss on both 

 occasions, and I have named the species after him. 



Bibliography. 



1. GossE, P. H. : On the Structure, Functions and Homologies 



of the Manducatory Organs in the Class Eotifera, Phil. 

 Trans., vol. cxlvi., pp. 419-452. 1856. 



2. Milne, W. : On the Defectiveness of the Eye-spot as a 



Means of Generic Distinction in the Philodinaea, Proc. 

 Phil. Soc, Glasgow, vol. xvii. pp. 134-145. 1886. 



3. Janson, 0. : Versuch einer Uebersicht iiber die Rotatorien- 



Familie der Philodinaeen. Bremen, 1893. 



4. Bryce, D. : Further Notes on Macrotrachelous Callidinae, 



Journ. Quekett Micr. Cluh, Ser. 2, vol. v., pp. 436-455. 

 1894. 



5. Milne, W. : On the Function of the Water- vascular System 



in Eotifera, with Notes on some South African Floscularia, 

 vol. xxxvi., pp. 118-127, Proc. Roy. Phil. Soc.^ Glasgow, 

 1905. 



6. Bryce, D. : On a New Classification of the Bdelloid Eoti- 



fera, Journ. Quekett Micr. Club, Ser. 2, vol. xi., pp. 

 61-92. 1910. 



