354 Mr. C. W. Andrews on Fossil Remains of 



and Gadow (Trans. Zool. Soc. vol. xiii. pi. xxxiv. figs. 9 & 10)j 

 as the type specimen upon which the species Sarcidiornis 

 mauritianus is founded^ is indistinguishable from some of 

 these Malagasy specimens, and therefore is also entirely 

 unlike the metacarpus of Sarcidiornis : it really belonged to 

 a species of Chenalopex, which may or may not be distinct 

 from that under description. As in the case of the other 

 bones of the skeleton, the specimens of the metacarpus fall 

 into two groups, in one of which they average about 85 mm. 

 in length, in the other about 76 mm. ; these latter are the 

 moi'e numerous. In the larger specimens the spur is 

 relatively larger, and these, no doubt, belong to the male 

 birds. 



The length of the type metatarsus of Sarcidiornis mauri- 

 tianus is about 77 mm., that of a specimen of C. cegyptiacus 

 80 mm. 



The pelvis differs widely from that of Sarcidiornis, and 

 approaches that of Clienalo'pex cegyptiacus in many points ; 

 thus the whole post-acetabular region is Avider, and, seen 

 from below, shallower than in the former genus, and the 

 centre of the urosacral vertebrie are wider and their trans- 

 verse processes more prominent and separated by deeper 

 fossse. The greater width of the post-acetabular region is 

 chiefly due to the expansion of the hinder portion of the 

 ilia. In one specimen the ischiadic foramina are smaller 

 than in the pelvis of C. agyptiacus, with which I have com- 

 pared it, but it appears that this is merely due to the 

 extension of ossification in the connective tissue which closed 

 the opening consequent upon age. The pectineal process is 

 much more prominent in the fossil than in the recent form, 

 and there are some slight differences in the fenestration of 

 the sacral region. 



The femur, the length of which is the same as those of 

 Sarcidiornis and Chtnalopex (egxjptiacus, with Avhich it was 

 compared, differs from the former in being much stouter in 

 the shaft and ia possessing more massive articular endsj 

 from the latter the main point of difference is the stouter 

 shaft. 



