Some languages use a special form of the noun (a ‘numerative’) after some or all numerals. In such languages, a distinct numerative is typically not available for all nouns, but rather only for a small subset, forming a morphological “minor category” (Corbett 2000). We examine how such a system emerges and disintegrates diachronically, looking in detail at Welsh, a language in which a distinct numerative emerged as the result of the phonological attrition of plural suffixes and analogical extension of new plural suffixes to all relevant syntactic environments except after numerals. Nouns with distinct numeratives tend to be animate and to denote units frequently counted, an association previously noted also for minor duals (Plank 1996). We ...