DEVELOPMENTAL STIMULI IN THE CESTODA. 



127 



strobila its characteristic appearance are frequently curled back 

 and outward, giving the posterior end a quite different outline. 

 In the living specimen I have frequently seen masses of sperm 

 ejected from the penis, but my records of this do not mention 



wr 



u 



YQ 



VDl 



VD 



uo 



ED 



SR 



YD 



YQ 



YG 



SG O 



FIG. I. Reproductive organs of a motile proglottid of C. laciniatum. C, cilia, 

 like spikes at anterior tip ; ed, egg duct from shell gland to uterus ; gp, genital pore ; 

 o, ovary ;/, penis ; fs, penis sheath ; sg, shell gland ; sr, seminal receptacle ; t, testes ; 

 tt, uterus ; no, uterus opening through which the eggs escape ; vd, vas deferens ; I'd' , 

 denser inner end of same ; i>a, vagina ; wt, large water vascular tube ; yd, yolk duct ; 

 yg, yolk glands. 



