The Iguanas (Hydrosaurus, Gray) have a slight bluish tinge about the head and neck; but in the distribution of their colours, generally resemble H.Gouldii.
Mr.Gilbert found a land crab in the moist ground under a log of wood; and Mr.Calvert brought me a species of helix of a yellowish green colour.
Dec.

18 .-- It was with very great difficulty that we collected our horses and cattle; but we could not find one of our pack bullocks, which had concealed himself in the scrub, and, from the unfavourable situation of our camp, we were obliged to abandon it.

Old bullocks, when tired, care very little about company, and even like to retire to any solitary spot, where there is good feed and water.

Having nearly reached the end of our stage, we were overtaken by a thunder-storm from the south; which was followed by another from the west with very heavy rain.

This was the first heavy rain to which we had been exposed, whilst on the day's march; for thunder-storms did not generally rise till after two o'clock; at which time we were usually secured in our tents.
The fine lagoons--which I called "Brown's Lagoons" after their discoverer--and the good feed about them, induced me to stop for the purpose of killing the fat bullock which Mr.Isaacs had given us, and of drying it like the charqui of the South Americans; instead of waiting till Christmas, as we originally intended; especially as we were ignorant of the character of the country before us.