316 



The Large Poplar Longhom 



more anteriorly in the abdomen than the other. Viewed laterally, each 

 body is flattened from above downwards, and is rounded at the edges. 

 In both ventral and dorsal view each appears as a round-shaped disc 

 with a cavity in the centre. From the centre of the cavity on the ventral 



Fig. 15. Male reproductive organs of S. carcharias (greatly magnified). The chitinous 

 parts are here shown in side view. ag = accessory gland; cd = common or ejaculatory 

 duct ; D — dorsal side of median lobe ; is = internal sac ; ml = median lobe ; sp = spiculum 

 gastrale; s£ = tube ensheathing the common duct; sv = seminal vesicle; < = tegmen; 

 ts = testes; V — ventral side of median lobe; vd = vas deferens. 



surface of the more anterior body, a tube arises which passes into 

 the other body of the same testis, entering it at a point on the second 

 corresponding to that from which it takes origin. 



