262 



DR. M. KHAHL ON THE NEMATODE 



edge of the mouth collar. The mouth collar is -02 mm. long and 

 "1 mm. in diameter. 



Head 2ycipiUce. — The four submedian head papilhe are fairly 

 long, with a knob-like mass on their top. This is continuous 

 with a ducfc-lik'e canal passing in the substance of the papilla? and 

 previously alluded to as possibly the duct of a corresponding 

 head gland. The two latei^al papillfe are small and delicate, and 

 directed mainly laterally, giving tlie square-like appearance to 

 the head. 



External leaf-crown. — This is composed of 24 thin leaflets 

 surrounding the OA^al-shaped mouth-opening. Seen from the 



Text-fiffure 60. 



SO// 



Memphisia aziza Khalil. Ventral view of head. 



ventral aspect the rays in the centre project more than those 

 on either side. 



Cervical papilke. — The long and thin cervical papillae are placed 

 ■82 mm from the cephalic extremity. 



Mouth cajysule. — The oral cavity is longer than it is broad. It 

 is pear-shaped, being narrow at its outlet. The chitinous ring 

 surrounding the oral cavity is very thick, and almost rectangular 

 in optical section. It is -045 mm. in length and -072 mm. in 

 diameter. A thin chitinous offshoot surrounds the oral cavity 

 in its terminal half. At the floor of the mouth capsule there is 

 a ring of 24 sharp teeth, probably representing an internal leaf- 

 crown. 



Cephalic glands. — There are four cephalic glands surrounding 



