Browsing by Author "Polhill, R."
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Item East African Slugs of the Family Urocyclidae(1960) Polhill, R.; Verdcourt, B.In tropical regions the problems of specific differentiation are often much more difficult than, for example, in Britain; this is not merely due to the great difference in the amount of work which has been carried out in the latter country. Species do appear to grade into each other in some tropical groups and the more material one examines the more confused does the situation become. When a little material is available from a small area one finds that several distinctive forms appear to be recognisable but when an abundance of material is available from a much wider area these distinctions often break down.
