53° ON A NEW SPECIES OF PLESIOSAURUS 



Sixteenth cervical vertebra. ;„ ^^^^^^ 



Centrum. — Longitudinal diameter o 9 



Vertical to base of neurapophysis ' I i 



Thence to top of neural spine I 4 



Neural spine vertically o 8 



Neural spine longitudinally o 7 



Costal pit. — Longitudinal measure o 5 



Vertical measure o 3 



Costal pit to base of neurapophysis o 6 



Dorsal region. — Total length 26 5 



Sixth dorsal vertebra. 



Centrum. — Longitudinally i 25 



Vertically (anterior face) I 3 



Transversely I g 



Neural spine. — Vertically 2 i 



Longitudinally o 9 



Transverse process. — Length o 75 



Antero-posterior diameter o 5 



Vertical diameter o 75 



Sacral region. — Total length 2j in. 



First sacral vertebra. 



Centrum. — Vertically i 3 



Transversely i 65 



Upper edge of centrum to summit of neural spine 2 2 



Neural spine — Vertically i 55 



Longitudinally (about) o 7 



Lower edge of body to origin of transverse process o 75 



Thickness of transverse process o 82 



Length o 25 



Sacral rib. — Length i 3 



Thickness of distal end o 6 



Caudal region. — Total 26 o 



Eleventh caudal vertebra. 



Centrum. — Length o 9 



Vertical i 15 



Transverse I 35 



From upper edge of centrum to summit of neural spine 2 8 



Length of neural spine. — Vertically (about) i i 



Longitudinally o 65 



Ribs. — nth measured along its curve n o 



Diameter of head o 7 



Diameter of body 045 



Humerus. — Long 7 2 



Thickness of anterior end from above downwards : .. i 9 



{long 3 3 



tlji;;)^ o 5 



Femur. — Long 7 15 



Anterior extremity from above downwards r 8 



' Reckoned as the deepest part of the depression under the zygapophysis, no suture being 

 visible. 



