RHYNCHOCEPHALIA, 619 
like in appearance, it measures from one to two feet 
in length, has a compressed crested tail, is dull olive-green 
spotted with yellow above and whitish below.+ It is now 
rare, but is preserved in some small islands off the New 
Zealand coast. It lives in holes among the rocks or in 
ee burrows, feeds on small animals, and is nocturnal in 
abit. 
Fic. 337-—Heart and associated vessels of tortoise.—After Nuhn. 
y.a., Right auricle; superior vene cave (s.v.c.) and inferior vena 
cava (z.v.c.) enter it. 7.v., Right half of ventricle ; pulmonary 
arteries (#.a.) and left aortic arch (2.aa.) leave it ; ced., coeliac; 
d.ao., dorsal aorta. Z.a., Left auricle; #.v., pulmonary veins 
enter it. Zz., Left half of ventricle; right aortic arch (7.a0.), 
giving off carotids (¢c.) and subclavians (s.c/.). 4s 
The skull, unlike that of any lizard, has an ossified quadrato-jugal, 
and therefore a complete infra-temporal arcade; the quadrate is firmly 
united to’ pterygoid, squamosal, and quadrato-jugal; the pterygoids 
meet the vomer and separate the palatines; there are teeth on the 
palatine in a single longitudinal row, parallel with those on maxilla 
and mandible, and the three sets seem to wear one another away; 
there is also a single tooth on each side of a kind of beak formed by’ 
the premaxille ; the’nares are divided. i 
The vertebree are amphiccelous or biconcave, as in geckos among 
lizards and in many extinct Reptiles. Some of the ribs bear uncinate 
