50 ME. E. LTDEKEEE ON A NEW 



deep, and has its termination blunt, rounded superiorly, and angu- 

 lated inferiorly. The difference in the form of the hinder half of 

 this hone from the pointed extremity of the same part in both 

 I. Mantelli and /. hernissartensis is very marked and, coupled with 

 the greater vertical depth of the bone, would, apart from other 

 evidence, indicate the specific distinctness of its owner. The ilium 

 indicates a species intermediate in point of size between the two 

 above-mentioned forms, and in contour comes nearer to that of 

 Eypsilo])hoclon, but is very widely different from the corresponding 

 element in Camjotosaurus. The pubis associated with the ilium is 

 too imperfect to afford much information, but the portion imme- 

 diately in advance of the acetabulum is deeper than in /. hernissart- 

 ensis. The apparently associated metatarsals are of the short and 

 massive type of typical species of Iguanodon ; a second left meta- 

 tarsal (No. E. 999) being undistinguishable from the corresponding 

 bone in small examples of I. hernissartensis. 



I have now to mention a sacrum and the associated ischia (No. R. 

 811) also obtained from the "Wadhurst Clay, although belonging to 

 a different individual from the preceding specimens, which I regard 

 as the types. Other specimens (No. E. 604) from the same loca- 

 lity and bed, comprising part of a left pubis and a considerable 

 number of imperfect vertebrae, may be regarded, according to 

 Mr. Dawson's information, as weU as from their mineral condition, 

 as almost certainly belonging to the same individual. A.n anterior 

 dorsal agrees very closely with the figured anterior dorsal of /. Prest^ 

 wichi, although its arch is slightly lower, and thereby differs widely 

 from SpTienospondylus. Turning to the sacrum and ischia, and seeing 

 that the latter, although clearly Iguanodont, differ from the corre- 

 sponding bones of both /. Mayitelli and I. hernissartensis, and agree 

 approximately in relative size with the ilium of the present form 

 (as is shown in fig. 2, where the left ischium is figured), the pre- 

 sumption is so great as to amount almost to a certainty that they 

 belong to the same species as the latter, and they will accordingly 

 be so regarded. These ischia measure 0'870 (36-5 inches) in length, 

 and closely resemble in general contour the corresponding elements 

 of Camptosaurus, and less closely those of Hypsilo]p}iodo7i. They 

 differ from the ischia of typical species of Iguanodon by being 

 relatively shorter and stouter, by the absence of twisting in the axis 

 of the shaft, by the more hammer-like head, and the longer interval 

 between the pubic process of the latter and the obturator process. 

 Their resemblance to the ischia of Camptosaurus and Hyp>silop}iodon 

 suggests that in the present form the pubis may have been equal in 

 length to the ischium. The sacrum included five anchylosed ver- 

 tebrae, which are of the inferiorly fiattened type of those of Cam- 

 'ptosaurus and /. PrestivicJii. 



The foregoing notes indicate that we have here to do with a 

 Wealden Iguanodont which is certainly distinct from both I, Man- 

 telli and /. hernissartensis, and which I cannot identify with SpTieno- 

 spondylus gracilis. It was probably more nearly allied to the 

 Kimeridgian /. Prestwichi, although, in the absence of any definite 



