_Gasterosteus Pugettii_, the Puget Sound Stickleback (Grd., Proc. Acad., Nat. Sc. Phil., viii. 1856).—_Sp. Ch._: Body only in part plated, peduncle of tail not keeled; the three dorsal spines without serrations; the anterior one inserted immediately behind the base of the pectorals; ventrals inserted anterior to the second dorsal spine. The colour is very much like that of _G. serratus_, but more decidedly purplish on the sides the eyes bright red in both species, when fresh from the water. _Gasterosteus concinnus_, the Tiny Stickleback (Rich., F. B. A., p. 57, vol. iii.).—_Sp. Ch._: Head one-fourth of the total length, mouth small, and teeth but feebly developed; dorsal spines nine, seventh and eighth smaller than the preceding ones, the ninth longer than any of the others. The abdomen is protected by a bony cuirass, and the ventrals represented by two spines. All the spines are moveable, and destitute of serrations. Colour of the back a bright sea-green, sides purplish-pink, shading away to a silvery-white on the belly the entire body speckled with minute black spots. This handsome little stickleback, though smaller in size than his brethren, is vastly more abundant. Sir J. Richardson speaks of it ‘as being common in the Saskatchawan, ranging as far north as the 65th parallel.’ So abundant are they in the lakes and pools about Cumberland House, east of the Rocky Mountains, that sledge-loads are dipped out with wooden bowls, and used for feeding the dogs. I have seen cartloads of these tiny fish in a single pool, left by the receding waters after the summer floods, on the Sumass prairie and banks of the Chilukweyuk river. As the water rapidly evaporated, the miserable captives huddled closer and closer together, starving with hunger and panting for air, but without the remotest chance of escape. The sticklebacks die and decompose, or yield banquets to the bears, weasels, birds, and beetles; the pool dries, and in a few weeks not a trace or record remains of the dead host of fishes. In the smaller streams, a bowl dipped into the water where the sticklebacks were thickest, could be readily filled with fish.