The chromosomes of some Tasmanian rodents

The karyotypes of three species of Tasmanian rodents, Rattus lutreolus Grey, 1841 (2n=42), Pseudomys higginsi Trouessart, 1897 (2n=48), and Hydromys chrysogaster Geoffrey, 1804 (2n=48), are described and illustrated. The most sucessful preparation method, from bone marrow,is described and the results discussed in the light of other published results.