192 



S. J. JOHNSTON. 



axes at right angles to the long axis of the body, and are 

 surrounded by a very loose connective tissue or a cavity 

 crossed by strands of connective tissue (Text fig. 2). The 

 two vasa deferentia unite at a level some distance in front 

 of the ovary after running for a space 

 closely applied to one another, to enter 

 together a more or less capacious 

 vesicula seminalis; in some speci- 

 mens it is very much larger than in 

 others. There is no cirrus sac nor 

 cirrus, but a fairly long ejaculatory 



Fig. 3. — Transverse 

 section through the va 



gina of Scaphanocephalus duct with a gr0U p of prostate Cells 



austrahs, showing the 



muscular layers in its round its proximal end, lying free in 

 ^c'.m.^circuUr tne body parenchyma. This duct 

 close alongside the female 



thelium ; 



muscle; Bm., radial mus- 

 cle ; L.m., longitudinal 

 muscle. 



C.s.b. 



opens, 



opening, into a tubular common cham- 

 ber 0*107 mm. long by 0*05 mm. 

 wide. The walls of the vagina or 

 metraterm are muscular and simi- 

 lar in structure to those of the 

 ejaculatory duct. Surrounding the 

 epithelial lining is a strong layer 

 containing radial fibres, and in 

 addition, longitudinal fibres closely 

 applied to the layer of circular 

 (text fig. 3). 



The form of the "cone shaped" 

 body of J'agerskiold, and the 

 arrangement of the muscular layers 

 round the combined genital sinus 

 Fig. 4.— Longitudinal sec- and ventral sucker correspond 



"SSC" close, y with what is described for 



genital sucker. C.s.b., cone- S. expaflSUsS 19 ' vv ' 6 ' 10) The part of 

 shaped body; G.s., genital 



sucker; v.sk., ventral sucker, this complex sucker that represents 



