Bulbous pharynx; a single ventral ovary; follicular testes; separate gonopores, the female opening ventrally, the male opening into the pharynx cavity; no accessory male apparatus; depressed epidermis; internal eyes in connection with the brain; paired multicellular ciliated pits; shell glands discharging onto ventral body surface; four pair fully differentiated nerve trunks; protonephridia with ventral pores, in front of female pore, right and left of median; a genito-intestinalis duct connects the antrum (female) or oviduct with intestine; bulb with a stylet on it, which leads in a pocket formed by widening of male genital canal, which opens in the mouth tube;
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