The Anus Is Placed At The Distance Of One-Fifth From The Extremity Of The Tail.

The full-grown animal weighs from forty to fifty pounds.

Its eggs are much larger than those of pigeons, and less elongated than the eggs of the terekay. They are covered with a calcareous crust, and, it is said, they have sufficient firmness for the children of the Ottomac Indians, who are great players at ball, to throw them into the air from one to another. If the arrau inhabited the bed of the river above the cataracts, the Indians of the Upper Orinoco would not travel so far to procure the flesh and the eggs of this tortoise. Yet, formerly, whole tribes from the Atabapo and the Cassiquiare have been known to pass the cataracts, in order to take part in the fishery at Uruana.

The terekay is less than the arrau. It is in general only fourteen inches in diameter. The number of plates in the upper shell is the same, but they are somewhat differently arranged. I counted three in the centre of the disk, and five hexagonal on each side. The margins contain twenty-four, all quadrangular, and much curved. The upper shell is of a black colour inclining to green; the feet and claws are like those of the arrau. The whole animal is of an olive-green, but it has two spots of red mixed with yellow on the top of the head. The throat is also yellow, and furnished with a prickly appendage. The terekays do not assemble in numerous societies like the arraus, to lay their eggs in common, and deposit them upon the same shore. The eggs of the terekay have an agreeable taste, and are much sought after by the inhabitants of Spanish Guiana. They are found in the Upper Orinoco, as well as below the cataracts, and even in the Apure, the Uritucu, the Guarico, and the small rivers that traverse the Llanos of Caracas. The form of the feet and head, the appendages of the chin and throat, and the position of the anus, seem to indicate that the arrau, and probably the terekay also, belong to a new subdivision of the tortoises, that may be separated from the emydes. The period at which the large arrau tortoise lays its eggs coincides with the period of the lowest waters. The Orinoco beginning to increase from the vernal equinox, the lowest flats are found uncovered from the end of January till the 20th or 25th of March. The arrau tortoises collect in troops in the month of January, then issue from the water, and warm themselves in the sun, reposing on the sands. The Indians believe that great heat is indispensable to the health of the animal, and that its exposure to the sun favours the laying of the eggs. The arraus are found on the beach a great part of the day during the whole month of February. At the beginning of March the straggling troops assemble, and swim towards the small number of islands on which they habitually deposit their eggs.

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