606 
DR. GUNTHER ON THE ANATOMY OE HATTERIA. 
of which is rather compressed in the vertebrae of the anterior two-thirds of the trunk, 
becomes more flattened on its abdominal surface in the lumbar region, and still more in 
the sacral and two or three anterior caudal vertebrae. 
The three lumbar vertebrae are distinguished merely by the shortness of the haemapo- 
physis, which does not reach the abdominal sternum, and is quite rudimentary at the 
second and third lumbar vertebrae ; their pleurapophyses form horizontal transverse pro- 
cesses, not entirely anchylosed to the diapophysis, a suture being visible ; however they 
do not appear to be moveable. 
The pleurapophyses of the two sacral vertebrae are about thrice as strong as the pre- 
ceding, constricted in the middle, and swollen at both ends, the sutures by which they 
are united with correspondingly increased diapophyses and with the ilium being very 
distinct ; their iliac extremities are in contact with each other. 
Hatteria is one of those Lizards in which the tail, when mutilated, is reproduced* ; 
however, it is much less easily broken than in the Lacertidce, GecJconidce , &c., its external 
integuments being less distinctly divided into segments or verticelli, and strengthened 
by a thick layer of strong subcutaneous fibrous tissue. The centrum of each caudal 
vertebra (fig. 23) is divided into an anterior and a posterior portion, as in other Lizards 
with verticellated tailf, the epiphysial line passing through the middle , and behind the 
transverse process ; this line corresponds to the external vertical furrow between two 
vertice lli. The neural spines, which on the three anterior caudal vertebrae are as strong 
as those of the sacral region, become gradually shorter and thinner, and disappear entirely 
on the posterior third of the tail. The haemapophyses, coalesced as in other Lizards, 
appear first between the third and fourth caudal vertebrae (fig. 21), are there rather longer 
but much narrower than the neural spines, and, becoming more feeble towards the 
extremity of the tail, disappear entirely on the last six or seven vertebrae. The trans- 
verse processes of the first two caudal vertebrae are nearly vertical to the longitudinal axis 
of the vertebral column, and not much shorter than those of the sacrum ; all the remainder 
are obliquely directed forwards, and become rudimentary with the eighth vertebra. 
Bibs and Sternal Apparatus of Thorax and Abdomen. 
The pleurapophyses of the fourth and fifth vertebrae have been described above (p. 11) ; 
those of the sixth and seventh are not much longer than that of the fifth ; but their distal 
ends are considerably more dilated (fig. 17). All the pleurapophyses mentioned have 
cartilaginous haemapophyses slightly ossified at the base. The anterior (of fourth vertebra) 
is quite rudimentary ; but the third and also the fourth (of sixth and seventh vertebrae) are 
much dilated at the base, the dilatation extending some way upwards along the posterior 
edge of the pleurapophysis, and overlapping the succeeding pleurapophysis. There is no 
anterior projection as in Crocodiles. The pleurapophysis of the eighth vertebra is slender, 
* One specimen, in which, the posterior third is reproduced, has a rudimentary appendage at the base of the 
reproduced portion, an anomaly frequently observed in other Lizards. 
f Cuvier, Reeherehes, vol. x. p. 13. 
