1895.] loritjs pi/atopalliattts and psittacus eeithacts, 331 



The SaceaIj Veetebe^. 



The solid mass formed by these vertebrae (figs. 18 & 19) is longer 

 than broad and narrows gently backwards. Its ventral surface is 

 slightly grooved antero-posteriorly in its middle. It develops no 

 parapophysial transverse processes, and so a large long fossa (If) 

 lies on either side of it, roofed by the ilivmi and bounded in front 

 by the parapophysial transverse process of the last lumbo-sacral 

 vertebra and behind by the transverse process of the first uro- 

 sacral vertebra. Eudiments of diapophysial portions of trans- 

 verse processes appear to coalesce with the ventral surface of the 

 ilium of this region. 



The TJeo-saceai, Veetebe^. 



These vertebrae (figs. 16, 18, & 19) continue on postaxiaUy the 

 sacral mass, narrowing gradually as they proceed. It develops a 

 series of parapophysial transverse processes (pt), six at least on 

 each side, which extend outwards, backwards, and slightly upwards, 

 anchylosing with the ischium at their apices. They anchylose w^th it 

 also for more or less, or for the whole, of their extent in P. enthacus. 

 The diapophysial elements of the transverse processes are \^-idely 

 extended antero-posteriorly, and unite so as to form the dorsal sacral 

 escutcheon (es), which is a continuous sheet of bone save for the 

 sacral foramina, which indicate the limits of the diapophysial trans- 

 verse processes — interposed between the hinder halves of the two 

 ilia and the two ischia. In L. Jlavoj^aTliatus each of the transverse 

 processes on either side of the first uro-sacral vertebra is quite 

 separate from the ischium above it till close to the apex of the 

 transverse process, when it anchyloses therewith. Its dorsal 

 sacral escutcheon also is almost entirely postaxial to the acetabula 

 instead of extending in front of them as in P. enthacus, and 

 presents on either side a marked antero-posterior groove {ges), 

 widening backwards from its apex, which is placed in a line nearly 

 coincident with the hinder margin of the acetabulum. These two 

 grooves are separated by a strongly-marked antero-posteriorly 

 extending ridge (narrowing postaxiad), which is only faintly 

 indicated in P. erithams. 



The Catidai. Veetebe^e. 



There are six caudal vertebrae in L. j{av(ypalliatus (fig. 12, p. 324), 

 with variously developed neural spines, zygapophyses, transverse 

 processes (<), and hypapophyses. 



The first three caudal vertebrae have transverse processes (t) 

 which are simple, flattened above and below, and slightly increase hx 

 length from the first to the fourth caudal vertebra. Those of the 

 first are about as long as those of the last uro-sacral vertebra. 

 The prezygapophyses (pz) of the first of these vertebrae extend 

 but very slightly forward, those of the other two extend preaxiad 

 more and more. 



