I 962) also reproduced similar histological appearances in dogs by occluding the superior mesenteric artery. Although the histological features in our patient did not suggest an ischaemic origin the barium enema showed multiple, rounded, filling defects in the transverse colon, a sign known as ' thumb-printing' (Lea Thomas, 1966). This has been described in human ischaemic colitis and is thought to be caused by mucosal oedema and submucosal haemorrhage consequent upon the ischaemia (Boley, Schwartz, Lash, and Sternhill, 1963 ; Marston, Pheils, Thomas, and Morson, 1966; Marcuson, Arthur, Chapman, and Marston, 1969). I t does not appear to have been described in a non-ischaemic condition. The misleading appearance of ' polyposis ' seen on the radiographs was caused by the nodules of mucopus.The prognosis for patients developing pseudomembranous inflammation of the bowel is poor and the majority of reported series are of necropsy cases. Our patient was deteriorating rapidly despite vigorous fluid and electrolyte replacement and seemed certain to die had a conservative regimen been continued. Tanner and Hardy (1968) advocate surgical excision of the affected segment, but their z cases were of small-bowel inflammation. This report appears to be the first describing colectomy in the management of pseudomembranous colitis.Acknowledgements.-We

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The positions adopted by C. doricha Rothschild, 1985 during swimming and resting periods are described.A sharp decrease in the amount of swimming carried on by the cercariae was shown to occur in the first few hours. A change of activity from long swimming and long resting periods to irregular swimming and resting was also demonstrated. The active life of these cercariae was found to be from two to three days.The possible vertical distribution of C. doricha in the sea is tentatively discussed.

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