13. _Trepang gama._ 14. _Trepang taai konkong._ 15. _Trepang bilala._ This is black, and the only species that is flat. 16. _Trepang massee._ 17. _Trepang katjang goreng._ This is small, and is also cured with the bark of the _kayu bankudu_. 18. _Trepang kuwas._ 19. _Trepang puti._ This sort is small, and of a whitish colour. After the trepang is caught, it is immediately boiled in sea-water, in which the leaves of the papya are steeped, to take off a thin skin which covers it. It is then placed in baskets or holes, and covered up with earth until the following morning, when it is washed repeatedly to deprive it as much as possible of the disagreeable taste of coral which it possesses, after which it is spread out on mats, and dried. Even then it is not entirely free from the unpleasant flavour which is peculiar to all holothuries or polypes, for which reason the Chinese, before making it up into soups or ragouts, boil it with sugar-cane. The Arafuras sell the trepang to the Bughis and others by the ukur, a measure containing about half a picul. The traders sort the trepang, there being a great difference in the value of the various kinds. The price of the first sort in China is one hundred and twenty Spanish dollars the picul, while the various sorts mixed together can be purchased at the back of the islands, as the eastern parts are called, at the rate of ten to fifteen Spanish dollars the picul. The number of the traders, who now visit the Arrus, has caused the price of this article to increase considerably above that which was formerly given. When the people of Banda had the trade exclusively in their hands, a picul of trepang might be obtained for a sarong, or piece of cloth of the value of eight guilders, and twenty birdsnests for a chopping-knife; while now the latter, which will weigh less than a kati, or 1-1/4lb., cannot be purchased for less than from fourteen to eighteen guilders. These articles would, however, still yield a large profit were it not necessary to remain among the Arrus for a period of four months to collect a cargo of any importance. On this account small brigs and paduakans only are employed in the trade, as their expense is less than that of larger vessels.