Huene and Lull — Triassic Reptile Ilallopus. Ill 



Diameter 33 mm above the distal end 2 ,nm 



Diameter at the distal end 5*5 



Tarsus. — In the right foot the astragalus, calcaneum and 

 cuboid still remain. 



The astragalus is a very thick bone, rounded beneath. It is 



Fig. 5. Left astralagus in its natural connection with the tibia. Twice 

 natural size. Seen obliquely from lateral side and behind. 



Fig. 6. Left calcaneum, twice natural size. Seen from above. The lower 

 edge of the figure is the tuber calcanei and the long straight border is the 

 lateral one. 



as broad as the distal end of the tibia and it has a short and 

 thin ascending process at the posterior corner of the lateral 

 border. Below that process the surface of the astragalus is 

 concave for the articulation with the fibula and calcaneum. 



Transverse diameter of astragalus 9 mm 



Supero-posterior diameter of astragalus 4 



Height with ascending process 10 



Height without ascending process (medial border) 6*5 



The calcaneum is a very large but strongly compressed bone. 

 Except for the compression it is like the same bone in croco- 

 diles, but with a large tuber. It is not preserved in the natural 

 position, but turned downwards with the metatarsus. 



Greatest length of calcaneum.. 15 mm 



Its thickness near astragalus 4 5 



Its thickness at the tuber I '5 



The cuboid is only recognizable by its position on the top of 

 metatarsal IY. It is a thick, cushion-like bone rounded be- 

 neath, 6 mm broad and 3*5 mm thick, laterally with a face for 

 metatarsal Y. 



Metatarsus. — The foot had five toes but the first is not pre 

 served. The fifth is vestigial and short, but the others are 

 extremely long and slender. In the right foot there are in posi- 

 tion, metatarsal II, III (better seen on the small slab) proxi- 

 mal end of IY, and Y (only in the great slab). There lies also, 



