98 Dr. C. I. Forsyth Major — A Giant Madagascar Rat. 



calculated at 129-5 and 160-7 mm. respectively. In the largest known 

 recent Rat, the Phlmmys of the Philippines (B.M. Xo. 97.3.1.17), 

 the skull has a basal length of 80 and maximum length of 90 mm. 



Tig. 1. — Eight innominate bone of a giant sub-fossil Eat, 'from Sirabe, Central 

 Madagascar, Ali/oryctes rapclo, gen. et sp. nov. tp.a.i. spina anterior inferior 

 ilei; 'f.i.p. tuberculum iliopectineuni . 



Fig. 2. — The same bone of ^Arvicolu amphibiii. 



Both figures are natural size. 



