The literature on congenital anomalies of calves is reviewed, and the author describes a case of malformation in a purebred Hereford heifer calf. This animal, which lived for 3 days, had two muzzles and two sets of rudimentary teeth and lower lips. There were four cerebral hemispheres but no duplication of the other parts of the brain. On the basis of the organs which were duplicated, the monster was termed a disprosopus, distomus, diotus, triophthalmos, ditelencephalus and monometencephalus.
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