264 M E M O I R S ?/' /^^ 
lliltains the weight, and there is but little labour of the mufcles 
required, only what is lufficient to bend the tail 3 for then, as by 
a hook, the weight of the whole body is hereby ful'pcnded^ and 
for the performing this, it wis obferved, that in each preceeding 
Vertebra there arofc a naufcle, which, was inferted on each fide 
of the fucceeding Vertebra -j which, upon its ading, muft ne- 
ceffarily bend that joint 3 but for the llrengthening the whole, 
there were obferved four mufcles to arife from the Os Sacrum^ 
which ran the whole length of the tail, two on the upper fide, 
and two on the under, fending each a tendon to each internode, 
or Vertebra-^ fo that when the fkin was ftripped off, the external 
parts of thefe mufcles leemed to have tendinous expanfions over 
them, the whole length of the tail, and to be almoft covered by 
them, which muft needs very much contribute to add ftrengrh to 
the tail, befides what may be the cffefl of their inierting of ten- 
dons into each joint or Vertebra in bending the tail: The ribs 
are faflened to the Vertebrae of the Thora^s^ and there are 1 3 on 
each fide 3 the feven foremoft are more perfectly articulated with 
the Sterrair/h ^^^^ ^^c fucceeding may, in forae meafure, be rec- 
koned Co{f(e l<loth<e'^ for tho' they are long, and as they proceed 
from t\\c VcrtebrcC^ inclined backwards towards the hinder legs, 
yet after\i-ards they are reflefted forwards towards the Sternum, 
or Cartilago Enjiformis j and tho' in other animak, that part of 
the ribs, which is faftened to the Os 'Pectoris, or Sternum be 
ufually cartilaginous, yet in this lubject it was obferved to be all 
bony throughout 3 there was however this difference, that ths 
ribs looked redder, by realbn of their blood-veffels, and this part 
was whiter, as one might plainly fee where it was faftened to the 
ribs 3 lb that it may well pals for a bony cartilage, as often car- 
tila:;cs become bony. The firft rib was only an inch in length, 
and^its bony cartilage a quarter of an inch 3 hence gradually\he 
ribs encreale in length 3 for the feventh rib was three inches long, 
and its cartilage an inch and a half 3 the four laft of the Cofta 
Nothce do again gradually Icffen in length 3 for the laft rib of all 
was only an inch and three quarters long, and its cartilage did 
not reach the Sternum, tho' the firft, fccond, and third of the 
Cojtie Noth^ did 3 the Sternum confifted of feven bones, accord- 
ing to the number of the fore-ribs, that are faftened to them 3 at 
the beginuing of the Sternum^ there jutted out a ftiarp bony car- 
tihif^e, which, from its figure, Dr. "tyfon calls Cartih^o Enfi- 
jh'viis'^ and here one extremity of the clavic'c was faftened 3 at 
the end of the Sternum, towards the belly, there was a broad, 
roundifh cartilage, which therefore he calls Cartilago Scutifor- 
D 
rnts 
