( X56 ) 
forwards towards the Sternum or CartUago Scutifcrmh. 
But I muft here take Notice, that thoug ^ ia Maif, and 
other Animals, that Part of the Ribs thu is failened to 
the 0$ Peilons^ or Stermm, be uiaally Cartilaginous ; 
yet here, m our Subjed:, I obferved it to be all B^)ny 
throughout. However, this Difference I found, that 
the Rihs did look redder, by reafon of the Blood Vefftls 
in them ; and this Part was Whiter, and where it was 
faftened to the Rihs, one m^ght plainly fee fo that it 
may well pafs for a Bony Cartilage ; as often, the Car* 
tilages do become Bony. The Firlt Ril was only an Inch 
long, and its Bony Cartilage a Qaarcer of an Inch; 
hence gradully the Rihs increafe in Length ; for the Se- 
venth Rih was Three Inches long ; and its Cartilage One 
Inch and Half. The Four laft of the Coft^ Noth£, gra- 
dually leffen again in Length ; for the laft PJh of all was 
only One Inch and Three Quarters long ; and. its Carti- 
lage did not run Home to the Os Pe^oris^ or Sternum^ 
though the Firft, Second and Third of the Co(l<e Noth£ 
did. 
The Os PeSloris, or Sternum, confifted of Seven Bones^ 
according to the Number of the Fore-Rihsj that are 
faftened to them. At the Beginning of the Sternum^ 
there jutted out a ftiarp Bony Cartilage, which, from its 
Figure, I lhall call, Cartilago Enfiformis '\ \ and heref 
was faftened One Extream of rhtClavicuU |) at the End 
of the Sternum, towards the Belly, there was a broad, 
roundift] Cartilage, which therefore I fhall call, Cartila- 
go Scutiformis h- 
There were Two ClavicuU [|, or Collar-Bones^ each an y 
Inch and Half long ; having one Extream faftened to the 
Firft Bone o\ the Sternum, or the Cartilago Enfiformis ; 
and the other End to the Spine f of the Scapula, near f 
the Conjundion of it to the Os Humeri. By means of 
this Bone, it can more advantagioufly bring its Fore-Feet 
to 
