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FOETAL SEX DETERMINATION in ten instances representing 1.3% of all pregnancies referred to the radiological department during 1956. The cleft is usually confined to the lumbar region. One further specimen was found in a series of 73 viable stillbirths. In every instance the child was a male. The normal proportion of ventral and dorsal ossification centres in foetuses before the 28th week of gestation is 33%, with no obvious male bias. It is suggested that the presence of the condition, which has no pathological importance, may be used as an aid in determining the sex of the foetus.

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