23G 



DR. M. KHALIL ON TITK NEMATOUK 



leaflets, fairly broad and bent cbaracteristicallj^ at tbeir tips. 

 They project a little distance above the head. 



Head pajnlhe. — The four submedian head papilUe project a little 

 above the month collar. They point straight forwards. Their 

 bases are broad and each is svunionnted by a long knob, the 

 function of which is pointed out elsewhere. The two lateral 

 head papillse do not project, and their termination is marked by 

 a depression. 



Cervical papiUce. — The two delicate cervical papillae are placed 

 a little posterior to the level of the caudal end of the oesophagus. 

 They are "78 mm. from the head in the female and "61 mm. in 

 the male. 



Text-fia-ure 29. 



6rO/y 



Qnilonia uffanda J\.ha]\]. Head. 



Mouth capsule. — The chitinous mouth capsule is -15 mm. in 

 diameter. It is oval in optical cross-section and is not in contact 

 with the wall of the oral cavity. The oral cavity is shallow and 

 funnel-shaped. It is 06 mm. deep and -ll mm. diameter at its 

 floor. The mouth-opening is -07 mm. in diameter. From the floor 

 of the oral cavity project two large chitinous oval teeth, each 

 surmounted by a delicate sharp spine. These are placed on the 

 cephalic end of the two sub-ventral oesophageal columns. 



Internal leaf-croiv)!,. — The short stumpy leaflets of the internal 

 leaf-crown correspond in number to the external crown. They 

 have a rounded end and do not project above the surface. 



(Esophagus. — There is a shallow oesophageal funnel surrounded 

 by a chitinous rim. The oesophagus is short and thick, being 

 •52 mm. in length in the male and -62 mm. in the female. Its 

 maximum diameter is "2 mm. and -21 ram. in the respective 

 sexes. The end of the oesophagus projects into the chyle intestine, 

 its opening being guarded by a trilobed valve. 



