C. E. Beecher — Reconstruction of a Cretaceous Dinosaur. 313 



swaying of the body and legs. The whole expression is one of 

 action and the spectator with little effort may endow this creature 

 with many of its living attributes. 



In seeking to secure a life-like pose for Claosaurus, considerable 

 assistance was afforded by photographs of existing animals in 

 motion, especially several illustrating bipedal locomotion among 

 living lizards. One of these is here introduced for comparison 

 (figure I). 3 



Figure 1. — Running lizard, illustrating bipedal locomotion. From photograph 

 of living Chlamijdosaurus, by W. Saville Kent. 



Synonymy. — It is not within the province or purpose of this paper 

 to enter into any analyses or discussions of generic synonymy, 

 though the proper reference of the animal here described is some- 

 what uncertain. The type species of Claosaurus ( C. ogilis Marsh 5 ) 

 was obtained from the Niobrara of Kansas, and is possibly gener- 

 ically distinct from the species afterward described from the Laramie 

 as Claosaurus annectens, by Professor Marsh. 1 Neither is it feasible 

 at present to bring evidence that Thespesius occidentalis of Leidy 4 

 does not include the Laramie type. The fragmentary remains upon 

 which Thespesius was based consisted only of several vertebra and 

 a phalangial bone. These portions seem to have very little diagnos- 

 tic value within the group. Therefore the relationships of these 

 forms, as well as questions of priority, must be left for future careful 

 comparisons, and for the present it seems best to accept the name 

 Claosaurus annectens for this species. 



Restorations of Ornithopoda. — Several restorations of various 

 members of the Ornithopoda have been already made, including the 

 genera Iguanodon, Hadrosaurus, Claosaurus, Hypsilophodon, Lao- 

 saurus, and Camptosaurus. The last three in the list have been 

 restored only by means of drawings. 



Hadrosaurus was modelled by Waterhouse Hawkins to represent 

 both the skeleton and the animal in the flesh. Owincr to the 

 extremely fragmentary remains upon which this restoration was 

 based it was necessarily very faulty and has long since ceased to 

 have any value or interest except as a historical attempt. A figure 



