WILLISTON AND MOODIE : OGMODIRUS MARTINII. 67 



The neurocentral articular surfaces are di\-ided into two por- 

 tions, separated by the rib articular surface. The most anterior 

 of the pygals indicates a sacral intumescence for the hind limbs. 

 Just what its size in proportion to the brain may be would be an 

 interesting matter. The intumescence extends through several of 

 the vertebrae and indicates an active use of the limbs as propelling 

 organs. The most posterior cen'ical preserved has no indication 

 of such an intumescence, so we must conclude that the neck is 

 still incompletely represented even with the fifty-one vertebrae, 

 and may have included six or eight more. Certainly none of the 

 vertebrae described above as cervical belong to the dorsal series. 



Forelimh. There was enough material present, although badly 

 scattered, which seemed to belong to a single member, to recon- 

 struct (plate II) a paddle which has been referred to the left side. 

 This limb has a total length of 0.600 m., of which 0.152 m. belongs 

 to the humerus, 0.050 m. to the radius and ulna, 0.070 m. to the 

 carpals, and perhaps 0.300 m. to the digital di\ision, although the 

 distal phalanges are lost. The breadth of the limb at the level of 

 the radius is 0.150 m., at the carpus 0.130 m. and at the third 

 phalangeal row 0.120 m. 



Fig. 2. The humerus of Ogmodirus martinii from the ventral side. 



