Three hundred and minety-one cases of primary pancreatic tumours, excluding endocrine tumours, were studied histologically. Carcinoma of the exocrine pancreas formned the largest group (98.5 per cent), benign tumours (1.25 per cent) and other malignant tumours (0.25 per cent) formed the remainder. Ductal adenocarcinoma was the commonest type and was divilded into four sub-types, papillary, well, moderately and poorly differentiated duct adeno-carcinoma. The moderately and poolrly differentiated tumours were the commonoest types. Papillary carcinoma was separated from the well differentiated tumours by its different morphological appearances and was found to exhibit different behaviour. Other special morphological types of pancreatic carcinoma, pleomorphic, mucinous, adenosquamous, acinar, microadenocarcinoma, cystadenocarcinoma and oncocytie carcinoma were also represented. Benign microcystadenomata (four cases) were considered because of their interesting morphological features and their singificance in the differential diagnosis of carcinoma. Based on the morphology and behaviour of these 391 tumours, the classification of panceratic carcinoma is discused and some rare types are compared with previously reported cases and discussed.