gravid proglottid of Taenia pisiformis.  The genital pore is on the right margin with the upper canal being the vas deferens, ending with the cirrus. The lower canal is the vagina. The branched pink material are diverticula of the uterus filled with egg capsules.  These gravid proglottids will detach from the worm and "inch" about in the stool. 100x