411 



length, and from 1| to 7 in width at the base, maintained a certain 

 parallelism with the vertebral column, as if they had been placed in 

 a line along the back. This circumstance, together with other 

 reasons, induced the author to suggest that they might be the re- 

 mains of a dermal fringe, with which, as in some recent species of 

 Iguana, the back of the animal was armed ; but at the same time he 

 mentioned many anatomical peculiarities, which led him to hesitate 

 in determining positively that these bones had formed such appen- 

 dages. He next entered upon a careful examination of the reasons 

 why they could not be processes of the vertebrae. Many dermal 

 bones, which served to support the large scales, were discovered 

 by the author in the stone. The author proposed forming a new 

 genus for this animal, the characters of which would depend on the 

 peculiarity of the sternal apparatus and the spinous processes ; and 

 he suggested the name of Hylseosaurus, or Forest-Lizard, to indicate 

 its locality, the Forest of Tilgate. In the conclusion of this memoir, 

 the author made some observations on the character of the district 

 at the Iguanodon era. From the condition of the organic remains, 

 which, with the exception of the beds of shells, and the vegetable 

 stems of the fossil Equiseta Lyellii, bore marks of transport, he 

 contended that the river which had formed the ancient delta, the 

 Wealden of geologists, must have had its source far distant from 

 the beds which it had formed ; and from the state of some of the 

 specimens (and he instanced particularly that of the Hylseosaurus), 

 he inferred, that the bones of the reptiles must have been broken 

 and dislocated while covered with muscles and integuments, other- 

 wise the broken parts and the displaced bones could not have main- 

 tained the relative situation in regard to each other which they 

 are now found to maintain. He concluded with an eulogium on 

 the late illustrious naturalist Baron Cuvier, many of whose observa- 

 tions, from his correspondence with the author, were introduced in 

 various parts of the memoir. 



