72 AVIAN CESTODES, 



opening lies just in front of the female pore. The genital 

 atrium is insignificant. 



The musculature is weak. The fibres belonging to the 

 longitudinal muscles are arranged in two concentric series of 

 bundles. Owing to the smallness and fragility of the para- 

 site, I was iinable to make satisfactory sections, and conse- 

 quently cannot give much information relating to the sub- 

 cuticular structures, the musculature, and the nervoixs 

 system. The transverse fibres were recognised, lying ven- 

 trally just below the developing uterus, and dorsally above 

 the male glands and ducts. The longitudinal nerve was seen 

 to lie laterally beside the main longitudinal excretory vessel. 

 The latter is a well defined tube, with a lumen of 0006 mm., 

 lying laterally near the junction of the medulla and cortex. 

 Each forms an arch with the concavity inwards, approxi- 

 mately limiting the outer edges of the medulla. A narrow, 

 transverse vessel lying close to the posterior border of each 

 proglottid, connects the main or ventral vessels of each side. 

 A dorsal, longitudinal stem was not seen. The genital ducts 

 pass dorsally to the nerve and excretory trunk of the corres- 

 ponding side. 



Male Genitalia. — The testes are from 17 to 22 in number, 

 and may be recognised, at about 04 mm. from the front "f 

 the scolex, as a number of small, round,' deeply staining 

 bodies arranged in a definite line at the posterior edge of the 

 segment, and extending from the ventral vessel of one side 

 to that of the other side. They rapidly increase in size, and 

 then are seen to be arranged, in surf ace- view, in two or three 

 overlapping rows, which are at different dorsoventral levels. 

 They lie behind the female glands, though they may some- 

 what overlap the vitellarium. Their position is distinctly 

 dorsal, the uppermost series bordering on the dorsal trans- 

 verse muscle. Each vesicle is approximately spherical, hav- 

 ing a diameter of from 0-0028 to 0035 mm. From each of 

 these passes off a large prominent vas efferens, which joins its 

 fellows to form the large, dorsally placed vas deferens. This 



