Cercariae develop in the daughter sporocysts, and when mature emerge from the snail. The cercariae swim around until they find a definitive host, whose skin they will penetrate. They migrate to the liver where they mature and then make their way to the mesenteric veins where the male and female worms join together. The female spends the rest of her life in the gynecophoric groove of the male. Eggs are laid in the mesenteric vein and make their way through the intestinal wall into the lumen of the intestine.
Eggs pass out in the feces.
Schistosome egg Illustration from Slaughter, J.B., Billups, L.H., Acor, G. K., Compendum Small Animal, Vol 10, No. 5, page 607, May 1988. Toxic dose has not been found. 500 mg not toxic in a single dose.