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Cottus poecilopus (Heckel).
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Cottus chamberlaini Evermann & Goldsborough, new species. Type.
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Cottus aleuticus Gilbert.
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Cottus leiopomus, sp. nov. (Type.). Little Wood River, Shoshone, Idaho
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Miller's Thumb (Cottus bairdi, var. punctatus).
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Cottus annae.
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Miller's Thumb (Cottus gracilis).
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California Miller's Thumb, Cottus gulosus Girard. McCloud River, Cal..
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Yellowstone Miller's Thumb, Cottus punctulatus (Gill). Yellowstone River.
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Head of Cottus Ferrugineus, Seen from the Front.
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Cottus klamathensis, new species.
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Cottus perplexus, sp. nov. ()Type.). Skookumchuck River, Chehalis, Washington
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Cottus macrops, new species. Type.
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Miller's Thump, Uranidea tenuis Evermann & Meek. Klamath Falls.
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Cottus princeps, new species.
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Uranidea tenuis Evermann & Meek, new species.
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Cottus gobio -- Scazzone.
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Cottus gorio (Cuvier).
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Head of Cottus gorio, Seen from the Front.
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Cottus gorio, variety Microstomus (Heckel).
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Cottus gorio, Variety Ferrugineus (Heckel and Kner).
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Head of Cottus microstomus, Seen from the Front.
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Cottus aspertima, new species. Type.
