580 PHILOSOPHICAL TRANSACTIONS. [anNO 17 10. 



The OS sacrum consists of five bones ; they are of a flat surface before, each 

 having three processes, (viz. two oblique, and one spinal, under which the 

 spinal marrow descends) behind. They are perforated before by 4 pair of holes, 

 placed at their interstices on each side. It is 12 inches long, and 74- broad* 

 where it is articulated with the ossa innominata above, and 6 inches broad at 

 the lower part. 



The tail consists of ig vertebrae, whose differences are to be seen in the fol- 

 lowing tables. From the os sacrum to the eighth they have five processes, viz. 

 two transverse, two oblique, and one spinal, under which the spinal marrow de- 

 scends, sending forth a conjugation of nerves from between each of them. 

 From the eighth to the sixteenth each has 4 processes, viz. two longitudinal be- 

 hind, between which the remainder of the spinal marrow still descends, and 

 two transverse: the rest have no process at all, but are of a kind of quadrangular 

 figure, having a ridge which descends before and behind, and on each side; be- 

 ing somewhat larger at each end, and smaller at the middle. All the vertebrae, 

 as well in the neck and back, as tail, had cartilages, which run between them ; 

 they were about -l inch thick in the back, thinner in the neck, and thicker pro- 

 portionably in the tail. These cartilages I was obliged to supply with leather in 

 mounting the skeleton. 



Because this is a quadruped, we shall divide the extremities into the fore and 

 hind ones. We begin the fore extremities at the scapula, which is usually 

 divided into its head, neck, spine. Processes, fore and hind cavities, (i. e. 

 these parts before and behind the spine) its concave part, which lies upon the 

 ribs, and its convex or outer part, and its margin. The head, which receives 

 the OS humeri, is oblong, (because the motion of the humerus performed by 

 this animal, is rather flexion and extension, than adduction or abduction) where- 

 fore the cavity being 5-^ inches long, is only 3-^ inches broad, and the margin 

 of the bone arising from the fore and back part makes it 2 inches deep ; for at 

 the sides the margin is equal to the cavity. At the back part there are two pro- 

 cesses ; that which regards its convex part is 2 inches long, rugous, thick and 

 obtuse : that which regards the concave, runs 2 inches backward, where it 

 forms an obtuse angle ; whence it ascends 3 inches to the neck : this has a 

 sharper edge than the former, being somewhat incurvated. Between these two 

 processes is a rugous sinus, 2 inches broad, ascending from the cavity of the 

 bead 2 inches to the neck, and rising somewhat in the middle of its progress. 

 The neck is flat, being more obtuse at its back part, and where the last named 

 protuberance is, and sharper before, where is a little protuberance toward the 

 spina on the convex side, being more plain on the concave. Between the first 

 of the fore-named protuberances and the spina, there is a sinus which ascends 



