NEW SPECIES OF OESOPHAGOSTOMUM. 



463 



A well-developed <£sophageal funnel is present ; this is goblet- 

 shaped and is lined with chitiu. The anterior margin of the 

 funnel has a thickened chitinous rim having an undulating 

 outline. Because of these undulations the depth of the 



Text-fio-uve 2. 



-Ex.T? 



Optical section of head, lateral view. 

 E L.C. = external leaf-crown; Ex. P. = excretory pore; Fl. = oesophageal flange; 

 I.L.C = internal leaf-crown ; M.Cap. = mouth capsule; Oes.F. = oesophageal 

 funnel; T. = dorsal tooth. 



Text-fioure 3. 



Frontal view oi head, diagrammatic. 



C.R.O. = chitinous rim of oesophageal funnel; D.T. = dorsal tooth; E.L.C. = 



external leaf-crown; M.C. = inouth collar; M.Cap. = mouth capsule. 



mouth capsule, which rests on the rim, is not everywhere the 

 same. From the anterior border of this rim arise three recurved 

 tooth-like processes, each about 7 /x long, situated one on the 

 summit of each of the three undulations ; these processes are 

 situated one dorsal and two latero-ventral, the three, however, being 



31* 



