Description of a New Species of Argulus. ity of the siphon in line with the eyes are

BY D. S. KELLICOTT.

two stout brown hooks. Abdomen onethird as long as cephalothorax, as broad as long, deeply notched, lobes acute; on the FOUND, parasitic on inner margin near the apex is a slender Lepidosteus osseus, taken tubercle with a few hairs; bodies at the in the Niagara River, at base of the lobes (female) large, brown, Buffalo, in September, ellipsoidal. Legs, first pair terminated by 1876, an Argulus which suctorial discs, second or ambulatory pair seems to be undescribed.

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Fig. 1. (x3)

FIG. 1. a, antennæ; e, eyes; s, suctorial discs of the first pair; am, Ambulatory or prehensile pair; f, natory legs; h, appendages of last pair; m, brown bodies; t, tubercles.

entire length of body; convex, transparent, its lobes barely covering the third pair of swimming legs. Eyes brown, compound, having about sixty areola. Antennæ, first pair two-jointed, second joint terminating in a slender hook, basal joint nearly as broad as long, having a hook on its anterior margin, also another on its posterior (difficult to show in figure); second pair slender, one-third longer than the first pair, fivejointed, first joint bears a hook at its base, with three strong teeth on the thighs, the second nearly at right angles to the first outer two rising from the same base, the (articulation with the same obscure), third inner one removed from the outer two oneas long as the first two, also equal in length half its length, more slender, the last joint to the fourth and fifth together, the last ends in two hooks; just back of the inserarticulation being very slender. There are tion of the second pair are two pairs of spines at the articulations. Posterior to hooks directed backwards; the remaining the antennæ, on either side of the extrem- four pairs, the nalatory legs end each in