450 J. W. SULKE ON IGUAlsrODON PEESTWICHII 



Lengths of Vertebral Centra 'tneasicred alone/ teJiir upper surface^'. 



Neck. 



Trunt. 



Tail. 



mm. 



mm. 





mm. 



No. I ... 43- 



No. lo... 42 



No. 28 a. 



50-5 



„ 2 ... 41-5 



„ 13... 56 



„ 28... 



50- 



„ 3 ... 41-5 



„ 15... 56 



)j 37- •. 



53- 



„ 6 ... 37- 



„ iS... 58 



,, 47... 



47. 







,, 51... 



39-5 







'' 55... 



32- 







'., 57--. 



26- 







„ 58... 



2-1- 



Pelvis and Hind Limbs. — The sacrum has just been described ; the 

 other parts referable to the hip-girdle are portions of both ilia, of 

 both pubes, and of one ischium. The limbs are represented by 

 pieces of both femora, of both tibiae and fibulas, ossa tarsalia, meta- 

 tarsals, and phalanges. 



Ilia, JSTo. iv. 1. — Part of the right ilium comprises the acetabulum 

 and all that part of the broad flat plate which lies above and behind 

 it. The greatest vertical dimension at the acetabulum is 135 

 millims. ; the length of the mutilated prseacetabular part is 110 

 millims. ; the coxal articular surface is an oblong, 80 millims. 

 long. It is widest behind, being here 43 millims. across. This 

 surface, which is coarsely pitted (as if an epiphysial incrustation 

 had been detached from it) is imperfectly divided at 45 millims. 

 from its posterior limit by a slight projection. The part behind 

 this is hollowed ; that in front of it is nearly plane, or slightly 

 convex. From the hinder and outer corner of the joint-surface a 

 prominent angular ridge curves upwards and forwards over the 

 joint, and gradually subsides on the smooth surface above it. A con- 

 spicuous sinuous line above the acetabulum probably marks the 

 attachment of the capsular ligament. That part of the ilium which 

 comprises the joint is the stoutest part of the bone. The inner 

 surface of the ilium is sinuous. Above the acetabulum are the im- 

 pressions of attachment of sacral ribs. 



The pieces iv. 2, a, b, c, d, are fragments of the left ilium. Of 

 these, iv. 2 cc shows that the acetabular part was produced for- 

 wards as a long slender process, which was longer than the post- 

 acetabular part of the bone. 



Pubes. — The fossils iv. 16, iv. 17, correspond essentially with 

 Wealden Iguanodont bones, now, I think, generally accejjted as 

 pubes. They are too mutilated for description. They show that 

 the pubis formed part of the acetabulum as in Lizards. 



Ischium. — The peculiar curve of the fossil iv. 18, and the process 

 indicated on one margin near the stouter end, identify this as part 

 of the long blade of an Iguanodont ischium. 



Femur. — These large and strong bones are principally represented 

 hy their extremities. The head, iv. 3, iv. 4, has the subglobular 



* The lengths of the sacral centra are already given in another Table. 



