326 



DR. E. W. SHTJFELDt's MORPHOLOGICAL 



where it shows two deep rounded notches on either side of the 

 carina. The outer pair of lateral processes which are thus pro- 

 duced have expanded posterior ends. As already stated, each 

 costal border supports four small transverse facets for theh{Bma- 

 poph jsial ribs, which are crowded pretty close together. Beyond 

 these the costal processes are of a quadrate outline on either side, 

 and are directed upwards and very slightly forwards as conspicuous 

 projections. 



Trihedral in form and rather inclined to bifurcate at its summit, 

 the well-developed manubrium is cultrate mesially in front and 

 this prominent apophysis rears itself upwards and forwards from 

 its usual site, as seen in birds generally where it is present. 

 Immediately behind it are the coracoidal grooves, which, though 

 narrow from above downwards, extend far out laterally and meet, 

 or very nearly meet, at the middle point posterior to the manubrial 

 base. 



Tlie keel of this bone is comparatively deep and extends the 

 entire length of the sternal body, while its inferior border is 

 gently convex for its entire length forwards, and its anterior one 

 considerably concave. At their intersection in front the carinal 

 angle is bluntly rounded off. 



Trom the fact that the xiphoidal processes are spreading in 

 character and the sides of the sternal body uniformly raised, 

 not an inconsiderable concavity is enclosed on the thoracic 

 aspect of this sternum ; and, as is usually the case in birds of 

 this form, the pelvis above is seen to be correspondingly wide- 

 spread, indicating roomy abdominal and thoracic cavities within 

 their enclosure. 



Pneumaticity is not a prominent feature of the sternum among 

 the Trogons, although a few insignificant foramina do admit air 

 to this bone where such openings ordinarily occur. 



Of the Shoulder- Girdle (PI. XIX. fig. 13).— We find the 05 

 furcula to be of the U-shaped variety, with a well-formed hypo- 

 cleidium of a rounded outline at its clavicular junction beneath. 

 The limbs of this bone are slender, while the heads are somewhat 

 expanded and much compressed laterally. They rest against the 

 mesial aspects of the superior tuberosities of the coracoids, and 

 on either side extend backwards to the scapula, which they over- 

 lap to some extent, resting upon the upper side of the clavicular 

 process of the bone. 



A scapula here mak^s the usual articulation with a coracoid 



