articulated with the meropodite that the axis of the appendage can flex through 180° in a longitudinal plane. The carpopodite is straight, subcircular in section, with a few setae on the anterior margin and with a distal projection of this margin in all the legs to form a short blunt spine overlapping part of the anterior margin of the propodite. The propodite is a long, cylindrical element bearing two rows of short spines on its posterior margin, each spine having a single short seta just proximal to it. In the 3rd leg the lateral row has six spines and the medial row five. In the 4th leg both rows have six spines, while in the 5th leg the lateral row has five spines and the position of the distal spine of this row is occupied by a compact cluster of setae which extends to the distal articulation (this feature is of generic importance). The medial row of the 5th leg has six spines. The anterior margin of the propodite in all three legs bears a few isolated setae as well as a tuft of terminal setae. The tapering, pointed, cylindrical dactylopodite is short, curved posteriorly and bears irregular tufts and isolated setae scattered over its surface. The 1st pleopod differs from the remaining four pleopods. The proximal articulation of the coxopodite with the body is indistinguishable, while the distal has a small convex projection on the anterior face. The basipodite is straight and flattened, with a small shoulder at the proximal end of the medial margin and with a flat flange on the entire lateral margin, bearing a few setae, this flange also extends distally beyond the distal articulation of the element. The basipodite has an irregularly convex distal margin and bears a short endopodite and a long exopodite. The flattened endopodite, one-third the length of the exopodite, arises partly posterior to it, its medial margin is concave, its distal end rounded and its lateral margin convex. The exopodite is a long, straight edged, blade-like element, tapering to a rounded distal end, and appears to be obscurely annulate, traces of the annlae being present on both margins. On this 1st pleopod there are four areas of plumose setae; a row on the distal portion of the lateral flange of the basipodite, a short row on the mediodistal angle of the basipodite, a row along the entire margin of the endopodite and a continuous row along the medial margin, the distal end and the lateral margin of the exopodite. A female in breeding-dress has longer and more numerous setae on the 1st pleopod. Breeding-dress is used by Höglund (1943) for the different arrangement of integument and setae which female Palaemon squilla forma typica assume at the moult preceding the breeding-period, and lose at the moult that succeds this period. The four areas of plumose setae of the normal pleopod are present, now extending over the entire medial margin of the exopodite, but only on the distal end of the endopodite, as well as the following additional rows; a row along the proximal half of the lateral margin of the basipodite, corresponding to group VIII of Höglund, a row along the entire medial margin of the basipodite, beginning with about two long setae (VII : 3), then a row of short setae (VII), then a row of long setae (VII : 1) along the distal one-quarter of this margin and finally a long curving row of setae (X) along the anterior face of the basipodite. This last row begins near the proximal articulation with a single very long seta (VII: 3A) and then with short setae it continues down the medial side of the anterior face. The 2nd pleopod of a female in breeding-dress has also this anterior plumose row of setae (X) but not as well developed as in the 1st pleopod.