ORDER DINOSAURIA. 



1 179 



beds, the Cetiosaur was inferred to have been of herbivorous habits. 

 How remarkably these conclusions have been confirmed by the discovery 

 of the allied American forms, is now a matter of history. 



In the Wealden sacral and caudal vertebrae of the general type 

 of those of Cetiosaurus, described under the name of Cetiosaurus 

 brevis, indicate a smaller form than Hoplosaurus. It is probable 

 that a dorsal vertebra from the same deposits, described as Bothrio- 

 spondylus elongatus, as well as a humerus and other bones of the 

 pectoral limb, to which the name Morosaurus Becklesi has been 

 applied, are referable to the same form, which would appear to be 

 generically distinct from Cetiosaurus, and may be known as Moro- 

 saurus brevis. The dimensions of some of the bones are given in 

 the table on p. 11 76. An ilium, from the same beds, closely 

 resembles that of the American genus, and probably belongs to 

 the same form. In North America, Morosaurus and the small 

 Pleurocoelus are characteristic of the Upper Jurassic. The dorsal 

 vertebrae of the latter are relatively elongated, and do not exceed 

 five inches in length; those of one species being remarkable for 

 their very low neural arches. Small teeth 

 from the Wealden (fig. 1078), once referred to 

 Hylceosaurus, probably belong to a species of 

 Pleurocoelus. These teeth are less spoon-shaped, 

 and approximate more to a compressed cone 

 than those of Morosaurus (fig. 1072) ; and the 

 genus Pleurocoelus includes the smallest repre- 

 sentatives of the suborder. The pelvis of 

 Morosaurus is shown in fig. 1077; the teeth 

 (fig. 1072), although considerably larger than 



\\T c r> j- j j t?7 7 u-u-x. Fl £- 1078. -Outer and 



those 01 Lardiodon and Pleurocoelus, exhibit profile views of a tooth of 

 the same incurving of the crown. from the Wealden . 



In the preceding forms the centra of the 

 caudal vertebrae are amphiccelous ; but Titanosaurus, originally de- 

 scribed from the Cretaceous of India, and subsequently found in 

 the English Wealden and Upper Greensand, has proccelous centra 

 to these vertebrae. The femur of this genus indicates an animal as 

 large as Cetiosaurus. 



Remains of other Cretaceous Sauropoda have received distinct 

 generic names, but some of them may be identical with the above- 

 mentioned types. Thus we have Dinodocus based on broken bones 

 from the Lower Greensand of Kent ; and ALpysaurus founded on a 

 humerus from the French Cretaceous. Macrwosaurus, from the 

 Cambridge Greensand, is a smaller form, with imperfectly proccelous 

 caudal vertebrae. Finally, the name Thecospondylus has been ap- 

 plied to a specimen from the Wealden, of which even the subordinal 

 position cannot be determined, although it has been suggested, 



