“ The largest British species, Gobius capito, occurring in the rock-pools of Cornwall, measures 10 in. Gobius alcocki, from brackish and fresh waters of Lower Bengal, is one of the very smallest of fishes, not measuring over 16 millimetres (= 7 lines) . The males are usually more brilliantly coloured than the females, and guard the eggs, which are often placed in a sort of nest made of the shell of some bivalve or of the carapace of a crab, with the convexity turned upwards and covered with sand, the eggs being stuck to the inner surface of this roof. ”