270 Transactions. — Zoology. 



The outer end is blunt and equals the base of pyramid, the inner end is 

 acute and curved. 



The inferior surface is situated between the antero-inferior and the postero- 

 inferior borders ; it is concave, and adapted for playing on the convexity of 

 the posterior border of ecto-condylar fossa. 



The anterior surface lies between the superior and the antero-inferior 

 borders ; outwardly it presents a shallow concavity, which plays on the outer 

 half of posterior and inferior surface of the tibial trochlea, whilst its inner 

 moiety presents a convexity which acts the part of a movable intercondylar 

 ridge to the back part of the tibial intercondylar groove. 



The posterior surface is between the postero-inferior and the superior 

 borders, and is convex in contour. It is bare and denuded of cartilage, but 

 presented the appearance of having at one time had a thin layer, and I should 

 fancy from the position of the tendons to it, much bursal tissue formerly 

 existed between it and them. 



A band of dried ligament connected the posterior margin of the sesamoid 

 bone with a depression at the back part of the intercondylar ridge of the 

 tarso-metatarsus. 



There are a few ligamentous remains attached to the apex of the calcaneo- 

 sesamoid, but their other attachments are broken. 



The tibio-tarsal bone of same side and same creature was found with the 

 above. Its distal extremity has a thin layer of articular cartilage spread 

 over its articular portion in a much more weathered state than that found on 

 opposing articular surface of this joint ; remains of ligaments are left in the 

 pits on the lateral faces of the condyles, and from the more prominent 

 tuberosity of the outer condyle a marked tuft of ligament proceeds. 



These are the remains of the outer and inner lateral ligaments of the joint. 



Matatarso-phalangeal joints : — 



The outer toe is complete, the middle toe has its two proximal bones, and 

 the inner or second toe has only its proximal segment. The hallux is entii'e 

 but displaced from its normal position. 



The posterior and inferior faces of the trochlesB of matatarsal bone are 

 covered with articular cartilage, but the anterior faces of these trochlece were 

 bare, and the bone much worn and weathered (fig. 1, c?.) 



The opposing articular surfaces of the proximal phalangeal bones are 

 covered with articular cartilage. 



Strong bands of ligament (the lateral portions of the capsular ligaments) 

 are present in the outer and middle toes on both sides, and on the outer side 

 of the inner toe, the proximal attachments of these ligaments are to the lateral 

 faces of the trochlese. 



