16 Art. 3.— T. Kabiiraki : 



deep violet colour. Tliey open to the exterior at various points of 

 the entire hody-surface. 



The unicellular glands undoubtedly secrete mucus and help 

 to attach the body of the worm more securel}" to objects or the 

 host, as can be seen when one attempts to displace the worm from 

 the latter. Moreover, it is very allowable to conclude thai the 

 mucus is used by the animal as a means of movement. The 

 worms are able to move by tlie action of tlie cilia in the mucus 

 layer between the ventral surface of tlie body and tlie substratum. 



Digestive System. 



The digestive system consists of the mouth, tlie pharyngeal 

 chamber, the pharynx, the glands which come into connexion 

 with the pharynx, and the intestine. 



The mouth is a small opening situated on the ventral side 

 nearly between the middle and the posterior thirds of the bod}^, as 

 alread}^ noted down, close to the termination of the pharyngeal 

 chamber. It is lined with a definite one-celled layer, being some- 

 what higher than the epidermis of the ventral surface. The 

 rhabdites are altogether absent around the mouth, and the cilia 

 are confined to the outside of the mouth. Beneath the epithe- 

 lium comes a basement membrane and layers of circular and longi- 

 tudinal muscular fibres, of which the layer of circular muscles are 

 remarkabl}^ well developed. 



The mouth leads into the phaiyngenl chamber, the lining of 

 which is very flattened and rests on a \'ery delicate basement 

 membrane, next to which exist feeble muscular layers consisting 

 of outer circular and inner longitudinal fibres. Towards the base 

 of the pharynx these muscular layers gradually increase in thick- 

 ness to a considerable extent and stand in direct continuation with 

 the circular and longitudinal muscles of the pharynx. Unlike in 

 Bd. Candida, no evidence of the insunken epithelium was found in 

 my own sections. 



Pharynx. — The pharynx, protruding into its chamber, is as 

 usual, a cylindrical body, of which the ratio to the body-length is 



