Didier (1943, 1954) has described the bacula of several Old World microtines, and other rodents. Argyropulo studied (1933a, 1933b) five species of Cricetinae and _Microtus socialis_. Ognev (1950) illustrated numerous species of Eurasian microtines. Hamilton (1946) figured and described the baculum of 11 species of North American microtines. Hibbard and Rinker (1942, 1943) figured the baculum of _Synaptomys cooperi paludis_ and of _Microtus ochrogaster taylori_. Dearden (1958) studied the baculum in two Asiatic species of _Lagurus_, in six subspecies of _Lagurus curtatus_ of North America, and in six other species of microtines of other genera. The baculum can be preserved easily with standa…
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