262 SUPPLEMENT. 



Iguanodon hollingtoniensis, Lydekker \ 



Considerably smaller than I. dawsoni, the limb-bones being of 

 the approximate size of those of /. mantelli, but the vertebrae some- 

 what larger. Ilium (imperfect) deep, with its superior border not 

 reflected ; the preacetabular process less deep than in I. jittoni, 

 without inner extension ; contour of postacetabular portion un- 

 known ; preacetabular notch deep, and pubic process directed for- 

 wards ; interval between pre- and postacetabular notches long. Ischium 

 as in Camptosaurus. Sacral vertebrae with flattened haemal surfaces, 

 and not anchylosed together. Femur (length 0,880 = 32 inches) 

 with curved shaft, * pendent ' inner trochanter, placed in lower 

 half of the bone, and the head set obliquely to the shaft, xinterior 

 and middle dorsal vertebrae with compressed centra ; rib-facet in 

 middle dorsals rising to summit of neural platform. The scapula 

 of the skeletons, Nos. R. 33, R. 1636, is relatively larger than 

 in other species ; that bone in the latter skeleton being remark- 

 able for its length and slenderness. 



In the structure of the sacrum, ischium, and femur this species 

 agrees with Camptosaurus, from which it is, however, at once dis- 

 tinguished by the modification of the phalangeal of the pollex into 

 a spine, as in typical species of Iguanodon. 



Hub. Europe (England). 



It is probable that the imperfect skeleton No. R. 33 (supra, i. 

 p. 226) f from Hollington quarry, belongs to this species. The bone 

 catalogued as a fragment of an ilium proves to be the imperfect 

 right coracoid. 



R. 1148 (supra, i. p. 217). These specimens with the following 

 (Fig.) associated ones are the types. The right femur, which 

 shows the entire inner trochanter, is figured by the writer 

 in the ' Quart. Journ. Geol. Soc/ vol. xlvi. p. 41, fig. 2, 



R. 1629. An associated series of bones belonging to the same indi- 

 vidual as the preceding; from the Wadhurst Clay of 

 Hollington quarry, near Hastings, Sussex. These comprise 

 the imperfect scapulae (a) ; the crushed left radius and ulna 

 (b) ; the phalangeal spine of the pollex (c) ; the left femur 

 (d) ; the imperfect left tibia (e) ; the proximal portion of 

 the left fibula (/) ; the second left metatarsal and the 

 associated proximal phalangeal (g) ; and several frag- 

 ments of ribs and other bones. The femur, which has 



1 Geol. Mag. dec. iii. vol. vi. p. 355 (1889). 



