CHELODINA EXPANSA, n. s. (Pl. XII & XIIa. adult and young.)
Shell oblong, rather depressed, broader behind, brown ; plates thin, with short, narrow inosculating grooves ; the margins flattened, espnnded ; the side of the back regularly convex ; the lateral marginal plates rather broad, not revolute. The sternum flat, bluntly keeled on the sides, yellow. Head, neck and limbs dark olive above ; chin, throat, and under side of the limbs whitish. Shell, length 11, brcndth 8 inches. Neck 8 inches long. The young shell is like the adult, but the lateral margins are slightly revolute on the edges, though the plates are broad like the adult. The under side of the margin yellow, with a triangular black spot on the front edge of each shield ; the dorsnl shield thin, with three distant concentric grooves, wit11 a rather rugose, moderate sized areola ; the areola of the costal plate subcentral ; the areola of the first vertebral plate is subcentral, of the second, third, fourth and fifth vertebral plate it is on the middle of tlie hinder margin; the areola of the marginal plate is on the hinder outer margin. The front vertebral shield is large, and as broad as long; the others are much bronder than long, the third being the shortest. This species differs from Chelodina longicollis, C. oblonga and C. Colliei, in the generally expanded form, and especially in the breadth and non-rerolution of the lateral margin, and in the side of the sternum not being so sharply keeled as in the two latter species. It differs from Chelodina aulcifera in the membranous character of the shields, and also in the sternum being narrow in front, like that of C. oblonga and C. Colliei, and not expanded and broader, as in C. longicollis and C. sulcifera.

CHELODINA LONGICOLLIS.
A fine shell of the adult animal of this species, larger than any 1 have hitherto received, was in the collection. The shell is rather convex and swollen on the sides, with a deep, broad, rounded concavity along the centre of the second, third and fourth rertebral plate, about two-thirds the width of the plates. The black sutural lines on the sternum are narrow and unifgrm. Length of the shell 8½ ; width 6 inches.

CHELYMYS MACQUARIA.
Two adult specimens of this kind were also ill the series. They are both much darker than tlie two specimens in the British Museum Collection. They are also peculiar for having a very distinct, deep, narrow, interrupted groove along the vertebral line, deepest and widest on the fourth vertebral plate. The discal shields are also marked with rather deep distinct radiating grooves, which are evidently indentations in the bones of the animal, only corered by the very thin skin-like shields. Shell, length 11, breadth 8 inches.