168 DR. C. W. ANDREWS ON LOWER MIOCENE [June 1914, 



of any concavity from side to side is also observed in the astragalus 

 of JPalceo mastodon and in a cast of an astragalus referred to Dino- 

 therium by the late Prof. A. Fritsch. At its outer side the tibial 

 surface passes by an obtuse angle into the convex facet for the 

 fibula ; internally it is obliquely truncated by a deeply- con cave 

 surface, apparently for the reception of a large internal malleolus 

 of the tibia : a similar, but a relatively still larger, depression 

 occurs in the astragalus of Palao mastodon. In the astragalus of 

 Fritsch' s Dinotherium the postero-internal angle of the bone, behind 

 the depression, is produced into a prominent knob, which may or 

 may not have been present in the specimen here described. The 

 navicular surface is separated from the tibial by a very short neck, 

 concave from above downwards. The surface itself is rhomboidal 

 in outline, and gently convex. The exact form of the ectal and 

 sustentacular facets for the calcaneum cannot be made out, owing 

 to the abrasion of their edges ; it can be seen, however, that the 

 sustentacular facet is separated from that for the naviculare by a 

 narrow groove, while in Palceomastodon and Tetrabelodon the two 

 meet in an angle. The two calcaneal facets are separated one 

 from the other anteriorly by a broad deep groove, which narrows 

 towards its hinder end, w T here the two surfaces probably meet ; they 

 are flat or gently convex. In an incomplete calcaneum referred 

 to Dinotherium, the corresponding surfaces agree in outline with 

 those of the astragalus just described ; but the sustentacular facet 

 is gently convex, so that it would not fit against the corresponding 

 astragalar facet — this may be due, however, to partial abrasion, 

 or to an individual peculiarity. 



The astragalus here described agrees very well with the cast of 

 the astragalus referred to Dinotherium by Fritsch, and with the 

 astragalus from Pikermi, described and figured by Graudry 1 as 

 that of Dinotherium, and there is little doubt that it belongs to 

 D. hobleyi. The dimensions (in centimetres) of this specimen 

 are : — 



Greatest length 8*6 



Greatest width 11*0 



"Width of the tibial surface (approximate)... 7*7 



A distal portion of a metapodial bone from Bed 20 at Kachuku 

 indicates the presence of a Proboscidean much bigger than 

 D. hobleyi. It is 6'7 centimetres wide at its distal articulation. 

 The shaft is nearly quadrate in section, but the flat anterior face 

 is rather wider than the posterior. The distal trochlea]* surface 1 is 

 somewhat abraded ; it formed rather more than a semicircle. On 

 one side is a deep pit for the attachment of ligament. This 

 specimen agrees very closely with the third right metacarpal of a 

 species of JElephas or Stegodon from the Siwalik Beds. It appears 

 to be much too large to have belonged to D. hobleyi. 



1 'Animaux fossiles & Geologie de l'Attique' 1862, p. 169 & pi. xxv, fig. 6. 



