46 PROFESSOR OWEN ON THE AYE-AYE. 
dorsal to the penultimate lumbar, beyond which there is a slight bend in the 
opposite direction to and including the sacrum. The bodies of the dorsal vertebra 
gradually lengthen and deepen as they approach the loins, with a narrower and at 
last almost carinate undersurface. The last two ribs join their own centrum close to the 
front intervertebral space ; the rest have the usual intervertebral articulation of the 
head. The first rib is the shortest (9 lines) and thickest ; the others increase in length 
to the ninth, and then gradually shorten to the thirteenth, which is | inch 3 lines in 
length. The tubercle and diapophysial articulation exist to the eleventh rib; the 
twelfth and thirteenth articulate only by the head. The diapophysis, longest on the 
first dorsal, very gradually shortens to the eleventh, where the beginnings of the meta- 
pophysis and anapophysis are manifest. These processes become widely separated in 
the twelfth and thirteenth dorsals, and the diapophysis is lost. The neural spines are 
of equal length throughout the dorsal series ; suddenly extending to 3} lines on the first, 
they gain gradually in fore-and-aft extent from the fifth dorsal to the last (Pl. XIX. p). 
The vertical spine is on the eleventh dorsal, towards which the rest of the dorso-lumbar 
series slightly incline. 
The vertebrz go on increasing in size to the fifth of the lumbar series,—the diapo- 
physes more especially, which recommence in the first lumbar; these processes are 
directed forward and downward, as well as outward, are truncate, with the anterior angle 
a little produced (d, fig. 8, Pl. XXI.); that of the last lumbar is similar in shape and 
direction, but is smaller than the two preceding. The anapophysis (ib. a) overlaps the 
front margin of the following vertebre to the fifth lumbar, in which it becomes too 
short; it disappears in the sixth. The metapophysis (7b. m) overhangs the back part 
of the neural arch of the preceding vertebra. The neural spine decreases from the 
third to the last lumbar (Pl. XIX. L), where it has 3 lines of length. The cartilage 
of the first rib is flattened, 54 lines long, and 23 lines broad ; in the rest it is more 
slender and rounded, increasing in length to the tenth, where it equals in length the 
bony part, and is attached to near the end of the ninth cartilage, which is the last 
that joins the sternum; the remaining cartilages are pointed, and rapidly shorten to 
the thirteenth, which is 8 lines long (ib. A). The first cartilage articulates with the 
manubrium (Pl. XXI. h, »9), the second to the seventh inclusive with the joints of 
seven sternebers, the eighth with the seventh sterneber, and the ninth to the joint 
between the seventh and eighth sterneber (7b. h,#). Of these eight bones, the first, from 
its superior size, carinate outer surface, and clavicular articulations, is termed the 
‘ manubrium ;’ the next six are narrow in proportion to their length, and similar in size 
and shape. The last, long and slender, may be regarded as the peduncle of the broad 
‘ cartilago ensiformis.’ 
The bodies of the cervical vertebra are broad, short, and flattened below in the last 
five. The last three (Pl. XXI. fig. 6, 5,67) have no neural spines : there are tubercular 
beginnings of these in the fourth and third ; in the second it is 2 lines long, thick, and 
