312 



A NEW NEMATODE PARASITE OP A LIZARD, 



attenuating towards the anterior (Text-fig. 1). Maximum diameter 320 fi, diminish- 

 ing to 64 fx, at the base of the lips. Tail short, straight, and conical, with a 

 mucronate tip ; anus 112 ^ from the extremity ; caudal pores 55 fi distant from 

 it (Text-fig. 17). Diameter of body at anus 128^. Details of the structure of 

 the mouth and buccal cavity are not very clear in the two whole preparations, 

 and the limited amount of the material prevents any other mode of examination. 

 The mouth is in the form of a transverse cleft, which lies only very slightly, if 



1. Female (x 7.5) ; 2. Anterior part of body, viewed from left side, showing 

 spine ridge (sp.) (x 47.5); 3. Dor.so-lateral view of anterior region (x 100); 4. 

 Portion of spine ridge near anterior end ' x 305) ; 5. Portion of spine ridge in 

 region of vulva (y 190); 6. Posterior termination of spine ridge (y 100). 



j., junction of oesophagus and intestine; n., nerve ring; oe., oesophagus; p., 

 post-cervical papillae ; v., vulva ; vag., vulva and vagina on ventral side, seen 

 through the transparent body; y., junction of muscular and glandular oesophagus. 



at all, lateral of the dorso-ventral plane, llie two lips which bound it are 

 lateral in position, and asymmetrical (Text-figs. 7-9). The right is higher than 

 the left, and is crowned by a stout conical median tooth, similar to the external 

 labial tooth of the genus Physaloptera. The tooth is about 5 fi high, and 6 fi 

 wide at base, and appears to ha.ve a very small denticle on its inner face, though 

 this could not be definitely determined. The appearance of lobes on the inner 



