The general thickness of this creature is that of a large pencil, but it varies according to the individual. The length is from one foot to fifteen inches or so.
There is a much smaller species of lampern called the Pride, Sand-pride, or Mud Lamprey, which is not more than half the length of the lampern, and only about the thickness of an ordinary quill. This creature has not the power of affixing itself like the lampern, on account of the construction of its mouth.
Having now taken a hasty glance at the vertebrated animals, we pass to those who have no bones at all, and whose skeleton, so to speak, is carried outside. Our representation of aquatic crustacea, as such creatures are called, will be the Cray-fish and the Water-Shrimp.
THE CRAY-FISH.
Every one knows the Cray-fish, because it is so like a lobster, turning red when boiled in the same way. This red colour is brought out by heat even if applied by placing the shell before a fire, and spirits of wine has the same effect. The last fact I learned from experience, and was very sorry that it was a fact, for the red shell quite spoiled the appearance of a dissected cray-fish that was wanted to look nice in a museum.
Being very delicate food, and, in my opinion, much better than the native lobster, they are much sought after at the proper season, and are sold generally at the rate of half-a-crown for one hundred and twenty.
There are many modes of catching them, which may be practised indifferently. There are the “wheels,” for example, being wicker baskets made on the wire mouse-trap principle, which the cray-fish enters and cannot get out again. Also, there is a mode of fishing for them with circular nets baited with a piece of meat. A number of these nets are laid at intervals along the river bank, and after a while are suddenly pulled out of the water, bringing with them the cray-fish that were devouring the meat.
But the most interesting and exciting mode of cray-fish catching is by getting into the water, and pulling them out of their holes.
Cray-fish take to themselves certain nooks and crannies, formed by the roots of willows or other trees that grow on the bank; and they not unfrequently take possession of holes which have been scooped by the water-rat. The hand is thrust into every crevice that can be detected, and if there is a cray-fish, its presence is made known by the sharp thorny points of the head,—for the cray-fish always lies in the hole with its head towards the entrance.