( 78) 



hj-papopli\'sif, there is a pair of ventral processes standing immediately below the 

 parapophvses. The centra of tho posterior cervicals and anterior dorsals are perforated 

 bv jmeumatic foramina. 



In the cervical region behind the fourth vertebra tiie neural spines are almost 

 obsolete, but in the (?) last cervical there is a short and broad one, and iu the 

 succeeding cervico-dorsals and dorsals they form large nearly rectangular plates 

 closely similar to those of Ocydromus. The exact number of dorsals is uncertain — 

 none of them ancliylosed with one another, but the last is fused to the lumbo-sacral 

 series. These latter will be referred to in the description of the pelvis. 



The ribs, of which six pairs are united with the sternum, are very broad and solid 

 at their upper ends; in all cases the uncinate processes are lost, having ajuiarentlv 

 been but loosely connected with the hinder border of the rib. 



In its general structure the slernuin very closely resembles that of L'ri/tlrromachus, 

 Ocydromus, and C'abalus, but the keel is much more reduced than in any of these, 

 and seen from the side is similar to that of Aphanripteri/.r. hroecki, lately figured bv 

 Xewton li Gadow.* In the larger specimens the ajicx of the keel is liifurcate, as in 

 Ocydromus, but in the smaller individuals only a trace of this structure is visible ; in 

 C'abalus sylvestris, C. diejfenhachil, Erythromachvs, and Aphanapteryx the ape.\ of 

 the crista is simple. The coraeoid grooves are widely separated from one another, and 

 their lower lips are not connected by any ridge : in Ocydromus, C'abalus diefenhackii, 

 and Ajjhanajdery.e there is alwajs a more or less distinct ridge between them. 

 Cabalus sylvestris ajiproaehes the fossil most nearly in this respect. The antero-lateral 

 processes are very large, and the tubercles for tlie attachment of the sterno-coracoid 

 ligaments are prominent, much more so than in Apjhana,ptery.e. In some specimens 

 the concavity of the ujiper surface of the sternum is much deeper than in others. 

 There are facets for the attachment of six pairs of sternal ribs. 



COMI'ARATIVE DIMENSIONS (iX MILLIMETRES) OF THE StEKNA I.N SEVERAL FLIGHTLESS 



Kails (1\Ieasi:re.ments of t\ao Speclmens ok that of UiAPHORArTEKY.x are 

 cihen) and 0I-- HYroTAENii)i.\ celebensis, Kalli's aquaticl's, and Tribonyx 



MORTIERI. 



• " On Additional Bones of the Dodo and other Extinct Birds of Mauritius," Tram. Zool. Sue. Vol. XI 1 1 • 

 (1893), PI. XXXV. Kiga. 14—16. 

 t This is the specimen 6g«red. 



