(117) 
We will therefore here remark the Sfrudure of the 
Mufcles, which, like Strings, do ferve to open and (hut 
this Pouch. But in the doing this, we muft firft defcribe 
thofe Two remarkable Bones this Animai has, more than 
is to be met with in any Sceleton befides, which are of 
great Ufe and Service herein : And, from their Office, I 
ftialJ take leave to call them. Ojfd Marfupialia, or Jani* 
tores Marfupii. I do not find they have been yet taken 
notice of by any and though they do belong to the 
Sceleton, yet I can't avoid their Defcription here, becaufe 
of the Mujcles that are inferted to them, that do ferve. 
to open the Pouch, 
\\ Tab. I. Thefe Off^a Marfupialia \\ or Jmttores Marfupii ( as I 
^' call them) are Two ftrong Bones, (o faftened to the up- 
per and inward Edge of the Ojfa Puhts, that at their 
Bafis here, they touch'd one another, juft at jhe Coali-. 
Yb, tion f of the Bones that forms the OJfa Puhu~. The 
""^* other Extreme of thefe Bones were fo diftant from one 
another, that it meafured Two Inches and an Half. The 
"f- d. e. Bafis * of thefe Bones', where join'd to the OJfa Pulis^ was 
■ Id, , half an Inch broad, having Two Heads; the larger !| 
t lyi^g "^a^ ^he Coalition of the OJjfa Pubis, and the lefler f 
towards the Os Coxendkis ; having in the middle a Sinusi 
into whica was received a Protuberance of the OJfa Pulis 
By which Contrivance it appears, there can be no M<^' 
tion of thefe Bones j nearer or farther from one another, 
but that they muft ftand always at an equal Diftance. 
Nor did I, upon trial, find ir otherwife but obferved, 
they were capable of a fmall Motion inwards towards the- 
Spine^ and outwards from it. Thefe Bones^ as they af- 
cended from the Os Pubis, grew flenderer, being about 
the Middle but a quarter of an Inch broad ; and they 
were each, Two Inches long. 
To each of thefe Bones there were beflowed Four Pair ^ 
of Mufcies : ThsiQ was another Pair thd^t did rmov^^ 
' • them 
