TWO DISTOMES. 



251 



distinct groups or clusters on each side, each group being com- 

 posed of 6 to 20 glandular bodies. They are ventrally placed 

 and follow the general course of the intestine. 



The tube from the forward clusters on each side meets that 

 from the rear clusters just inside the intestinal caecum and in a 

 transverse plane just posterior to the ootype. The transverse 

 tubes meet near the median plane, well toward the dorsal body- 

 wall, and from here a short tube leads to the yolk reservoir. 



I 



Tes 

 Ut(d). 



FIG. I. PntitntotKvces complexus, ventral aspect. O. s., oral sucker ; A., acetabu- 

 lum ; Ph., phar)nx ; Int. , intestinal crecum; JLxc. v., excretory vesicle ; Lt. , uterus ; 

 7>.f. , testes ; K. s. , receptaculum seminis ; Gen. p., genital pore ; Ov., ovary; Sh.g., 

 shell gland ; /*. def., vas deferens ; Y. g., yolk gland. 



FIG. 2. Diagram of female genital organs in P. complexus. Ov., ovary; Sh. g., 

 shell-gland ; Ut., uterus ; R. s., receptaculum seminis ; T. y. d., tranverse yolk duct. 



FIG. 3. Cross-section of Renifer e/ongafus in region of testes. Ut. (</), uterus, 

 descending; Ut. (a), uterus, ascending; Tcs., testis ; Int., intestinal caecum; 

 Exc. i'., excretory vesicle. 



From the yolk reservoir a tube extends diagonally forward and 

 towards the ventral body wall joining the oviduct after its entrance 

 into the shell gland. The yolk reservoir is a pear-shaped sac 

 about .12 mm. in length. 



