The spotted Blenny, Butter-Fish, or Gunnel-Fish, as it is variously termed, is found lurking under stones in the same places as the preceding. In the north of Scotland it is called 'cloachs,' and is used extensively as a bait for larger fish. When disturbed, it wriggles its body about in the muddy bottom of the rock-pool like an eel, for which, indeed, it is occasionally mistaken. Its length varies from three to nine inches; the depth only half an inch; the sides very much compressed and extremely thin. The dorsal fin consists of seventy-eight short spiny rays, and runs the length of the back almost to the tail. The most conspicuous feature in the Gunnel-Fish are the eleven round spots which occur at the top of the back, and reach the lower half of the dorsal fin; they are black, half encircled by white. The tail is rounded, and of a yellow colour. The back and sides are of a deep olive; the belly whitish. In its young state I have had this fish live in my aquarium for several months, but it never seemed to be happy or contented. The Five Bearded Rockling is almost as great a favourite with the writer as the Smooth Blenny. It is a very pretty fish, and may be easily tamed. In the course of a week I trained one to feed out of my hand, and when I put my finger in the water the fish would rub against it with its head, just as a favourite cat frequently does against the leg of a person with whom it is very familiar; moreover, if I moved the intruding digit with a circular motion through the water, the Rockling would waltz round the tip with evident signs of pleasure. This fish is often found in tide-pools, and may readily be identified by the prominent appendages attached to its head, to the presence of which, the Rockling owes its familiar appellation. The Goby (_Gobius unipunctatus_), or, as it is more popularly termed, One-Spotted Goby, is frequently found inhabiting the same pool as the Blenny or the Rockling. The distinguishing character of this pretty creature is the black spot which is situated between the fifth and sixth ray of the first dorsal fin. Its length is usually about one, or one and a half inches; specimens have, however, sometimes been found on the shores of the Frith of Forth, that measured nearly three inches. The colour of the Goby is very changeable. If the animal is labouring under excitement, its body assumes a deep brownish tint, approaching in some instances to black; this gives place to brown, drab, and even amber, or yellowish white. The Goby possesses the power of attaching its body to any object by means of its ventral fins, which become united together in the form of a funnel. Another species (_Gobius bipunctatus_), or Two-Spotted Goby, is generally found among the _Fuci_, in rocky situations. Its name is derived from a dark spot which is distinctly apparent on each side, near to the origin of the pectoral fin.