Abstract: When pregnant albino rats were administered orally with a newly developed molluscicide bromoacetamide at the dosage of≥24.8 mg/kg/d (≥1/5 LD50) for 12 consecutive days, starting from the 6th day of gestation, decreased live foetuses and some external abnormalities were observed. By comparison, an other molluscicide sodium pentaehlorophenate, a known teratogen, at the dosage of ≥25.1 mg/kg/d (≥1/9 LD50) produced much more pronounced skeletal and external dysmorphosis.