416 
JOURNAL OF THE PLYMOUTH INSTITUTION. 
Spines gradually increase in height to the sixth dorsal, or nine- 
teenth, four inches, from which they gradually decrease in height 
to the eighteenth caudal, where all indication of spine over neural 
foramen ceases. 
WIDTH ACROSS LATERAL PROCESSES : 
m. lines. 
Atlas . . . ..76 
Seventh cervical . . . ..46 
Second thoracic . . . ..50 
From which the width gradually diminishes to the seventh 
thoracic, which is . . . 4 1 
Eighth thoracic . , . ..59 
From which they gradually increase to the first dorsal, 
which measures . . . ..89 
Nearly same width to second lumbar . . .80 
from which it gradually diminishes to the tenth caudal, after 
which there is just an indication of a transverse process for three 
more vertebrae. 
Between all the vertebrae were intervertebral plates, each com- 
posed of two nearly circular discs of bone, with a cushion of 
cartilage between them. The surfaces of these discs, which were 
very irregular and denticulated, articulated very exactly with the 
bodies of the vertebrae between which they were placed. 
RIBS. 
Twelve pair. Anterior rather broader and flatter than the 
posterior, which were more slender. 
First rib, measuring round the bend, 10 inches, gradually 
increasing in length to the sixth, which was 1 ft. 8 in. 3 lines. 
The first six pairs of ribs articulated at two points with the 
vertebrae • viz., with the end of lateral process, and with the body. 
The seventh right rib had a false articulating surface, like the 
preceding rib, but only articulated at one point. 
There were seven pairs of false ribs and one odd one ; but to 
which side this belonged there was nothing to show ; the first 
three pair articulated with the sternum, the rest by cartilage. 
STERNUM. 
iii. lines. 
In two parts . . complete length 7 9 
Front plate (hexagonal) . . ,,4 6 
,, . . . width 4 0 
Posterior plate (quadrilateral) . . length 3 3 
,, . . width 2 0 
