226 



MR. W. K. PARKER ON THE OSTEOLOGY 



Length of coracoid 



Straight line from tip of ramus to angle of furculum 



Fowl . 



Tinamou 

 I Fowl . 

 I Tinamou 



inches, lines. 

 5 



Length of each furcular ramus along the curve J rowl . 



I Tinamou 



Length of sternal keel along its root I ' 



I Tinamou 



Length of sternal keel along the lower edge rowl . 



I Tinamou 

 Extent of ridge separating the middle from the great pectoral f Fowl . 



muscle iTinamou 



fFowl . 

 I Tinamou 

 fFowl . 

 I Tinamou 



Fowl . 



Tinamou 

 fFowl . 

 I Tinamou 

 fFowl . 

 i Tinamou 



Fowl . 



Tinamou 



Fowl . 



Tinamou 



Greatest depth of space for great pectoral muscle . . 

 Length of sternum, from episternum to xiphisternum . 



Length of episternum 



Length of hyosternum 



Whole length of internal hyposternal har along its curve 

 Average breadth of internal hyposternum .... 

 Narrowest part of entosternum 



2 



1 



2 



1 



2 



I 



3 



4 



3 



4 



3 



1 











5 



5 



















2 



4 



















10 



1* 







2 



6 

 10 



7 

 10 

 10 







6 



5i 



2* 



H 



4 

 4 

 10 

 6 

 9 

 1 



14 

 1 



The scapula of the Tinamou (PI. 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 

 huffoni) ; but here the rami are long. In some of the " Psittacinse," 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 (/r.) very common among birds, being U- 



