234 



DR. R. T. LEIPER ON 



[Feb.], 



The spicules are equal in length and measure 0'43 mm. and are 

 of a brown colour ; they have a peculiar and characteristic shape — 

 the proximal part is of uniform diameter, and then quite suddenly 

 tapers to a sharp point ; this attenuated portion resembling a note 

 of interrogation. There are two small pre-bursal papilla?. 



Text-fig. 26. 



Nematodirus hopkeni. 

 Bursa of male, showing absence of posterior loLe. 



Cervical papilla? are present in both sexes : they project as 

 acicular points 0*4 mm. behind the nerve-ring. In the female 

 the oesophagus measures 1*5 mm. in length. The anus is 0*25 mm. 

 from the tip of the tail. The vulva lies 3*83 mm. in front of the 

 anus. There is a short vagina of 0*1 mm., into which two uteri 

 open ; these uteri are provided with ovejectors. The ova are 

 thin shelled and measure 0*065 by 0*035 mm. I name this species 

 in honour of Baron Hermann v. Hopken, companion of our 

 wanderings in Uganda. 



Family Filarid;e. 

 Genus Filaria. 



2. Filaria hippopotami, sp. n. (Text-fig. 27 A, p. 236.) 



A couple of days after the dissection of one of the Hippos from 

 which the previously described material was obtained, I happened 

 to inspect some large pieces of the skin that my gun-bearer had 

 saved, and was drying in the sun. My attention was attracted 

 by the numerous white lines resembling pieces of cotton that 

 interlaced the strands of connective tissue still adherent to the 

 under surface of the skin. These on closer examination proved to 



