To _Icelinus_, _Artedius_, _Hemilepidotus_, _Astrolytes_, and related genera belong many species with the body partly scaled. These are characteristic of the North Pacific, in which they drop to a considerable depth. _Icelus_, _Triglops_, and _Artediellus_ are found also in the North Atlantic, the Arctic fauna of which is derived almost entirely from Pacific sources. The genus _Hemilepidotus_ contains coarse species, with bands of scales. The "Irish lord," _Hemilepidotus jordani_, a familiar and fantastic inhabitant of Bering Sea, is much valued by the Aleuts as a food-fish, although the flesh is rather tough and without much flavor. Almost equally common in Bering Sea is the red sculpin, _Hemilepidotus hemilepidotus_, and the still rougher _Ceratocottus diceraus_. The stone-sculpin, or buffalo-sculpin, _Enophrys bison_, with bony plates on the side and rough horns on the preopercle, is found about Puget Sound and southward. In all these large rough species from the North Pacific the preopercle is armed with long spines which are erected when the fish is disturbed. This makes it almost impossible for any larger fish to swallow them. [Illustration: FIG. 386.—_Ceratocottus diceraus_ (Cuv. & Val.). Tolstoi Bay, Alaska. ] [Illustration: FIG. 387.—_Elanura forficata_ Gilbert. Bering Sea. ] [Illustration: FIG. 388.—Yellowstone Miller's Thumb, _Cottus punctulatus_ (Gill). Yellowstone River. ] The genera _Cottus_ and _Uranidea_ include the miller's thumbs, also called in America, blob and muffle-jaws, of the Northern rivers. These little fishes are found in Europe, Asia, and America wherever trout are found. They lurk under weeds and stones, moving with the greatest swiftness when disturbed. They are found in every cold stream of the region north of Virginia, and they vie with the sticklebacks in their destruction of the eggs and fry of salmon and trout. _Cottus gobio_ is the commonest species of Europe. _Cottus ictalops_ is the most abundant of the several species of the eastern United States, and _Cottus asper_ in streams of the Pacific Coast, though very many other species exist in each of these regions. The genus _Uranidea_ is found in America. It is composed of smaller species with fewer teeth and fin-rays, the ventrals I, 3. _Uranidea gracilis_ is the commonest of these, the miller's thumb of New England. _Rheopresbe fujiyamæ_ is a large river sculpin in Japan. [Illustration: FIG. 389.—Miller's Thumb, _Uranidea tenuis_ Evermann & Meek. Klamath Falls. ] [Illustration: FIG. 390.—_Cottus evermanni_ Gilbert. Lost River, Oregon. ] _Trachidermus ansatus_ is another river species, the "mountain-witch" (yamanokami) of Japan, remarkable for a scarlet brand on its cheek, conspicuous in life.