2 I 1 PROCEEDINGS OF THE NATIONAL MUSEUM vol. bs 



Vertebrae. — Associated with the skull of specimen U.S.N.M. No. 

 16580 are 12 vertebrae, in three series of 3, 4, and 5 articulated verte- 

 brae, respectively. The series of five (fig. 10, A) evidently pertains to 

 the dorsal series, as evidenced by the parts of ribs found in association. 

 All the vertebrae are procoelous, with depressed centra. The centra 

 are rounded from side to side on the median ventral surface. On each 

 side of this median rounded portion the surface is traversed by shallow, 

 longitudinal depressions. The ball is set off by a faint annular groove. 

 The character of the articulations for the ribs cannot be determined 



Figure 10. — Vertebrae of Paraglyphanodon gazini: A, Ventral view of dorsal vertebrae; 

 B, lateral view of anterior thoracic or cervical vertebrae. X2J4- U.S.N.M. No. 16580 

 (type). 



from the available materials. The five articulated vertebrae illustrated 

 in figure 10, A, have a combined length of 19.4 mm. 



A second section of the backbone of this same individual is shown in 

 figure 10, B. These vertebrae are considerably shorter than the dorsals 

 described previously, and it is assumed they pertain either to the ante- 

 rior dorsal or the posterior cervical series. The zygapophyses are wide 

 apart, with articular faces nearly flat. The border between anterior 

 and posterior zygapophyses is shallowly incised by a wide, open notch. 

 Spine short, rectangular, without transverse enlargement of its top. 



U. 3. GOVERNMENT PRINTING CFFICEi 1943 



