148 R. W. Hooley — Integument of Wealden Dinosaurs. 



development — by completion of the secondary front wall — of a purely 

 Lepralian form with Steganoporellan structure. 



EXPLANATION OF PLATE IX. 



(All figures x 12 diams.) 



Fig. 1, 2. Membraniporella thoraciformis . Shawford, Hants. 

 3. ,, ,, Portsdown, Hants. 



4-7. 

 8. 

 9. 

 10-12. 



manonia. Portsdown, Hants. 

 transligata. Coltiskall, Norfolk. 



,, Trimingham. 



pyramidalis. , , 



II. — On the Integument of Iguanodon bernissartensis, Boulengeb, 



AND OE MOROSAURUS BECKLES1I, MaNTELL. 



By Keginald Walter Hooley, F.G.S. 



(PLATE X.) 



Integument oe Iguanodon bernissartensis. 



r HUE Iguanodon has been known since 1825, when the genus was 

 X first described from teeth by Mantell. 1 Odd bones and various 

 associated portions of the skeleton have been found in England, and 

 in 1878 the skeletons of many individuals were discovered in the 

 Wealden of Bernissart, near Mons, Belgium. 



No trace of the dermal covering has hitherto been observed. Owen 2 

 in 1885, when describing the bones of a "young Iguanodon'''' from 

 the Wealden of the Isle of Wight, mentions that " some portions of 

 a layer of dark finely granulated carbonaceous matter were found 

 embedded between the ribs, near the middle of the side of the trunk ", 

 which he queried as the integument of Iguanodon, but these remains 

 were proved later to belong to Hypsilophodon. 



In 1914 I obtained from the Wealden Shales of Brighstone Bay, 

 Isle of Wight, nearly the entire skeleton of a young individual of 

 Iguanodon bernissartensis, with the exception of the greater part of 

 the tail. 



In July last, while clearing away the matrix from the preacetabular 

 extremity of the left ilium, a portion of the epidermis (Fig. 1) was 

 exposed. It covers an area 90 mm. long by 40 mm. wide. The impression 

 of the integument is also discernible on another block 78 mm. long by 

 57 mm. wide, found in close proximity to the other. Fragments of 

 skin were also discovered underlying two of the left thoracic ribs. 

 On these latter specimens carbonaceous matter is to be seen. No 

 scutes or dermal ossifications were found. The skin is remarkably 

 thin, and covered with small convex tubercles varying in diameter 

 from 5 mm. to 3 mm. On the largest specimen there is an area, 

 8 mm. by 7 mm., where the tubercles are slightly larger and flatter, 

 and 65 mm. distant occurs another patch with the same measurement, 

 where the tubercles coalesce in such a manner that the tuberculation 

 is almost invisible. The tubercles on the edge of the skin at the top 



1 G. Mantell, Phil. Trans., 1825, p. 184. 



2 E. Owen, Mon. Foss. Eept. Weald. Form., pt. ii, 1855, p. 51. 



