•500 
TERTIARY VERTEERATA OF THE FATDM. 
AVidtli of front of first vertebral shield .‘fS 
Greatest length of plastron 40 
Length of plastron in middle line 3G'5 
„ anterior lobe 9 
AVTdtli of anterior lobe 17'4 
Length of bridge 17'7 
„ posterior lobe 14 
AVidth of posterior lobe 20-5 
Length of entoplastral in middle line G 
„ hyoplastral in middle line 8'5 
,, hvpoplastral in middle line 9 
,, xiphiplastral in middle line 9 
,, intergular shield G 5 
R. 3100. Anterior portion of a plastron. The dimensions (in centimetres) are : — 
Length of anterior lobe of plastron 9'5 
AVidth of anterior lobe of plastron 19 
Length of entoplastral 7'2 
„ intergular shield 7 
Presented hy IF. E. de IF/nton, Esq., 1903. 
R. 3120. Imperfect anterior lohe of plastron, probably of this species. 
Presented by TTb E. de Winton, Esq., 1903. 
Order SQUAMATA. 
Suborder 0 P H I D I A. 
Family BOID^. 
According to Boulengcr*' this family includes snakes in which the maxillary, 
palatine, and pterygoid bones are movable; transpalatine present; ])terygoid extending 
to quadrate or mandible; supratemporal present, attached scale-like to cranium, 
suspending quadrate ; prefrontal in contact with nasal. Mandible with coronoid boiu'. 
Teeth in both jaws. Vestiges of pelvis and hind limbs usually terminating in u 
claw-like spur visible on each side of the vent. 
* Catal. Snakes Brit. AIus. vol. i. (1893) p. 71. 
