3g Art. 4.— T. Kaliuraki. 



and inner longitudinal fibres. The deep muscular system, separat* 

 ed from this by a zone of tissue, forms a thick layer which consists 

 of two sets of fibres, longitudinal and circular, occurring inter- 

 mingled without being arranged in a definite layer. 



The mouth is a small opening situated near the centre of the 

 peripliaryngeal cavity, into which the plicated pharynx is protruded 

 from above. The intestinal trunks give off numerous bifurcated 

 lateral branches. Their direct walls are composed of a single 

 epithelium made up of high cylindrical cells which are placed verj'- 

 closely together. 



In the anterior region the nervous system presents a feature 

 of mesh work which passes behind into two longitudinal cords, con- 

 nected throughout by numerous commissures and provided with 

 lateral nerves towards the nerve plexus. 



The general feature of the copulatory organs in the normal 

 state stands somewhat at variance from that described by von 

 Gkaff, but the difference may be regarded as depending upon 

 different individuals and the condition of expansion or contraction 

 of the worm. A similar feature to that of von Graff I have 

 obtained with an individual, as shown in Text fig. 19. 



The genital aperture leads into the widely outbulged vesti- 

 bulum, which at the bottom is lined with an epithelium made up 

 of high columnar cells. The vestibulum receives the commmiica- 

 tions of the penis-sheath and the glandular organ. 



Numerous testes are ventrally arranged in a row on each side 

 of the body just outside the nerve cords, extending from behind 

 the ovary to the insertion of the pharynx. The vasa deferentia, 

 proceeding backwards, make an abrupt upward bend at the sides of 

 the penis to enter the penis-bulb and to fuse into a common duct 

 which soon communicates with the seminal vesicle. 



The penis is divided into two parts, viz., the bulbous basal 

 part of strongly muscular nature and the conical intromittent part 

 lying almost horizontally in the penis-sheath. Enclosed in the 

 latter part is a relatively narrow, smooth-walled seminal vesicle, 

 Avhich narrows behind into the ejaculatory duct, terminating at the 

 tip of the penis. In one case the wall of the vesicle projects into 



