Surgery for both limited range of motion as well as ulnar nerve compression is effective in cases of heterotopic ossification about the elbows of burned patients. Early operative intervention is indicated in progressive disease, particularly ulnar nerve palsy, if soft-tissue quality is adequate. Complications with 25% of elbows suggest that use of olecranon osteotomy for joint access may warrant review.

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189Summary A case of opocephaly in inbred guinea-pig strain 2jN and another in strain 13jN, a conjoined twin and an opocephaly concurrent with conjoined twins in the Dunkin-HartleyjFD strain are described. The incidence of congenital malformations in the inbred strain 2jN and strain 13jN was 0,0013 and 0,0073 % respectively. The incidence in the random-bred Dunkin-HartleyjFD strain was 0'0007%.Spontaneous congenital malformation of the guineapig have rarely been reported (Hoar, 1976). This is especially remarkable in view of the enormous numbers of guinea-pigs that are constantly being raised as laboratory animals. In a recent review of Case I. A conjoined twin Dunkin-HartleyjFD strain guinea-pig was found dead shortly after birth. The female twins had a single head with a broad face and 2 eyes. The upper abdomen was shared; the lower abdomen and hind quarters were separate and normally developed (Fig. ]). The fused thoracic cavities had 2 sterna, but only] normal respiratory system of larynx, trachea and lungs. There was a

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