250 Dll. M. KHALIL ON THE NEMATODE 



apiensis, iiganda, and ethiopica the external leaf-crown projects. 

 In Q. ethiopica particularly the shape of its leaflets is so distinctive 

 as to form a specific difierence. In Q. traii/vacra, africana, and 

 brevicauda the external leaf -crown is more or less hidden by the 

 mouth collar. 



Table II. gives in detail the vai-ious measurements useful in 

 difiei'entiating any species of Quilonia. The data for Quilonia 

 renniei and tranvacra are taken from Lane. The data for the 

 rest of the species are based on my pei'sonal examinations. The 

 numbers are given in millimetres. 



Genus Pteridophakynx Lane, 1921. 



Body is slender, with discoidal head. The rays of the external 

 leaf-crown vary in length. The oral cavity has the shape of an 

 inverted funnel, its cuticular lining coming into contact Avith the 

 circular chitinous ring which forms the oi'al capsule. The 

 (esophagus is short and wide. The internal aspect of the three 

 cesophageal columns may or may not be sculptured in a plumose 

 fashion. When this is present, the free intei'nal surface of the 

 oesophagus is moulded into a number of freely projecting ridges 

 which run obliquely outwards and posteriorly, giving it a 

 feathered appearance. 



In the male bursa the lateral ray has a prominence or acces- 

 sory i^ay on its posterior border, while of the three branches of 

 each dorsal ray the two outer are fused partly or to nearly their 

 tips. The spicules are equal and similar, and an accessory piece 

 is present. 



The vulva lies closely anterior to the anus, the vagina running 

 anteriorly aiid dividing into two parallel anteriorly directed uteri, 

 each provided with axi ovejecfcor. 



Type-species, Pteridopharynx africana Lane, 1921. 



Pteridophakynx africana Lane, 1921. 



Very little needs to be added to the description given by Lane. 

 The leaflets of the external leaf-crown are sixteen in number. 

 There ai'C two teeth projecting into the floor of the mouth capsule, 

 apparently regarded by Lane as the beginning of an oesophageal 

 funnel. The dorsal ray of the bursa before its final division 

 has an irregular outline. In some specimens this has the shape 

 of one or two processes, but this feature is not constant. Lane 

 did not see ova in any of his female specimens. I am able to 

 record their measurements as 62^1 long by 32 u broad. 



Habitat. Ston;ach of the African elephant (South Africa and 

 Uganda). 



Pteridopharynx anisa Khalil, 1922. (Text-figs. 47-51,) 

 Source of mate7'ial. — The matei-ial consists of more than thirty 



specimens. These I sorted out from the lai-ge stock of jiarasites 



collected by Prof. Leipei- in Uganda. 



