226 MR. W. K. PARKER ON THE OSTEOLOGY 
inches. lines. 
Length of coracoid . osairew ne 
Tinamou . 1 10 
Straight line from tip of ramus to angle of furculum . sil “Ou seme 
Tinamou. 1 0 
Length of each furcular ramus along the curve . are a iM 
Tinamou. 1 6 
Length of sternal keel along itsroot . . ...... te 3 tu 
Tinamou. 4 7 
Fowl 3 10 
Length of sternal keel along the | dge . { 
gth of sternal keel along the lower edge Pikeee ane 
Extent of ridge separating the middle from the xe Ban, eee 3 (0 
muscle . Tinamou. | 6 
Greatest depth of space for great pectoral muscle . : { 2 Cas 
Tinamou . O 22 
: ver, Fowl 5 124 
Length of sternum, from episternum to xiphisternum . air ak 
Tinamou. 5 = 14 
P Fowl Ont 
Length of epist | 
ength of episternum Tae ega gta 
Fowl 0 10 
Length of hyost apne 
ength of hyosternum Tinsnse oe 
Fowl 2 
Whole length of internal hyposternal bar along its curve 
Tinamou . 4 1 
: Fowl 0 14 
breadth hypost om 3 
Average breadth of internal hyposternum a | 
Fowl 0 3% 
Narrowest part of entosternum . : { Timon woe 
The scapula of the Tinamou (Pl. XXXIX. sc.) is blunt, or rather suddenly pointed at 
the end, near which is its broadest part, and not at the middle as in the Fowl: it agrees 
rather with that of the Syrrhaptes, being thick and narrow just beyond the glenoid facet, 
and then becoming gradually thinner and more outspread. It is pneumatic, and its 
size is in proportion to the sudden development of the wings. 
There are a few typical birds among the zygodactylous division, in which the furcular 
rami do not coalesce, as the Toucan (Ramphastos toco) and the Touraco (Corythaix 
buffont) ; but here the rami are long. In some of the “ Psittacinz,” however, the rami 
are very minute and abortive; these continue distinct, as in the Emu, in the Love- 
bird (Agapornis pullaria), but they coalesce with the coracoid in the Many-coloured 
Parakeet (Psephotus multicolor): this process has evidently taken place in the Ostrich, 
Cassowary, Rhea, and Apteryx. 
The Tinamou has a form of furculum (fr.) very common among birds, being U- 
