of the Chlami/phorus truncatus. 549 



phorus, like those of birds, are firmly united to the sternum 

 without the intervention of an elongated cartilage ; and, again 

 like those of birds, are also supplied with a false joint, at the 

 distance of about two-thirds of their length from the spine to the 

 sternum. The 9th, 10th, and 11th, being false ribs, are united 

 in the usual way to each other, and to the 8th, by elongations of 

 cartilage from their extremities. The portions of ribs inter- 

 vening between the false joints and the sternum are in the 6th, 

 7th, and 8th ribs, consolidated, broad, flattened portions of 

 bone, which form the boundary of the anterior and lateral parie- 

 tes of the thorax. The first bone of the sternum is broad and 

 flat, the superior surface regularly concave, the inferior irregu- 

 larly convex. Upon the anterior edge of the sternum are two 

 prominences to which are attached the extremities of each cla- 

 yicle. From each of these articulations a slightly elevated ridge 

 proceeds backwards along the inferior surface of the sternum, 

 converging towards the centre, where they become united and 

 form a prominent crest. The lateral edges of this first bone of 

 the sternum are articulated at its anterior extremity to the first 

 and broadest rib ; from this part the bone suddenly becomes nar- 

 rowed posteriorly, and terminates in a concave articular surface 

 to which the second bone of the sternum is attached. Judging 

 from the imperfect remains of the second bone, of which the 

 upper part only was distinguishable, it would appear that its 

 form was oblong, the superior surface concave. The remaining 

 portion of the sternum was too much mutilated to admit further 

 description. 



Lumbar vertebrae three, the spinous processes short and flat- 

 tened ; the two last dorsal vertebrae, as well as the lumbar, fur- 

 nished with long oblique processes directed forwards, upwards, 

 and outwards ; the transverse processes of the first two lumbar 

 vertebrae considerably elongated, the last possessing a rudiment 

 only. 



The whole of the sacrum and innominata is so peculiar and 

 unique in character, that I should despair of giving any correct 

 idea of this part, without the assistance of accurate representa- 

 tions. The superior part of the ilium is flattened, the upper 



