LOWER LIAS. 



Ungual Phalanx. Tab. II, figs. 4, 5, 6. 



The ungual phalanx transmitted with the foregoing leg-bones, from the 

 collection of Henry Norris, Esq., F.R.C.S., is somewhat intermediate in its 

 proportions between that of the hind foot of the Megalosaurus and that of 

 the hind foot of the Iguanodon ; it is less compressed than the former, less 

 depressed and flattened than in the latter. On one side of the base, near the 

 articular surface, it is impressed by a shallow, vertical canal (fig. 6, // ), extending 

 from the upper to the lower part of the bone. A median, low and broad, 

 vertical prominence extends from the upper half of the articular facet (fig. 5, b), 

 giving a sub-crescentic figure to the cavity of the joint; the lower border 

 is straight to near the apex, which is slightly bent down (fig. 4). There are no 

 indications of lateral grooves and foramina for blood-vessels. 



Bones of a young Scelidosaur. Tab. III. 



Subsequently to the exposure and acquisition of the foregoing fossils an intel- 

 ligent quarry-man discovered, in the same member of the lower Lias, a collection 

 of small bones, of a delicate, friable texture, of which those comprised in Tab. Ill 

 were brought to Mr. Harrison, by whom they were kindly transmitted to me for 

 description. The collection included the centrum or body of a vertebra (figs. 1 — 4), 

 a left femur (figs. 5, 6), a considerable portion of a tibia (fig. 7;, and fibula 

 (figs. 8 and 9), a tarsal bone (fig. 15), a metatarsal (figs. 10 and 11), and a proximal 

 phalanx (figs. 12 — 14). The long bones were much crushed, especially the femur. 

 This bone, therefore, appears to be thicker than it really was, being almost flat- 

 tened. The articular ends have been in a fibrous, unossified state, so that they 

 appear flatter or less prominent than they were in the recent bone. The external 

 trochanter (<?) seems entire, and has not risen higher in relation to the head of the 

 bone than is shown in fig. 5. The internal process (t) is similarly *vell pre- 

 served, repeating the character of the herbivorous Dinosauria which is exemplified 

 in the Iguanodon. The outer condyle of the femur is longitudinally grooved for 

 the fibula. The medullary or unossified cavity of the shaft of the bone has been 

 more considerable, in relation to the compact shaft, than in the large femora pre- 

 viously described. 



From the foregoing characters it may be concluded that the present femur 

 has belonged to a Dinosaur, allied to the Iguanodon, and to a very young indi- 

 vidual, and it most probably formed part of a very young or fetal Scelidosaur. 



Fig. 7, Tab. Ill, is a crushed tibia, with the upper end much produced for- 

 ward and bilobed behind, as in that of the Scelidosaur, the lower end is wanting. 



