400 EEPOKT OF COMMISSIONER OF FISH AND FISHERIES. 



articulated with it, and still more freely with the third 5 it is car- 

 inated below, but its articulations are much less free than in the next 

 genus. The third, fourth and fifth segments are each about the length 

 of the second ; the sixth and seventh are progressively shorter. The 

 first pair of legs (pi. XI, fig. 68 c) are quite robust and have but little free- 

 dom of motion, being directed forward under the head and hardly capa- 

 ble of further lateral extension than is shown in the figure of the animal. 

 The basis and ischium are large and articulated so as to form a curve, 

 bringing the legs forward ; the merus is short ; the carpus is triangular 

 and extends along the side of the thicliened propodus for about half 

 its length, projecting like a tooth at the end ; the propodus is ovate, 

 much thickened and armed with a tooth near the middle of the palmar 

 margin, along which it is ciliated, as is also the carpus ; the dactylus is 

 short and stout and tipped with a slender, curved, chitinous claw about 

 as long as the dactylus itself. The figure (pi. XI, fig. 68 c) represents the 

 inner surface of the leg, the merus being much less conspicuous on the 

 outer side. The second and third i^airs of legs are nearly alike and 

 much more slender than the first pair. One of the third pair is represented 

 on plate XI, fig. 68 d. In both these pairs of legs the carpus is small and 

 triangular and wedged in between the merus and propodus, which meet 

 above; the merus is a little larger in the second than in the third pair, 

 and in both pairs it is provided with a few setae at the upper distal 

 angle and along the opposite or palmar side, where the carpus is also 

 armed with setse 5 the dactylus bears a few very short sette. The re- 

 maining pairs of legs are rather more slender than the second and third, 

 and the merus is separated from the propodus above by the cari)us, 

 which is, however, short. These legs are somewhat hairy, like the pre- 

 ceding pairs. 



The anterior i^art of the pleon (pi. XI, fig. GSg), consisting of the first 

 five segments cousoUdated, appears much like an eighth thoracic seg- 

 ment a little longer than the seventh ; traces of the sutures between the 

 segments can be seen at the sides. The last segment is distinctly 

 articulated, a little elevated dorsally, where it is also somewhat hairy; 

 at the lower part of the sides it is covered by a shghtly projecting 

 lobe of the preceding segment, which extends over the proximal part 

 of the basal segment of the uropods. Distally the terminal segment 

 is depressed at a steep angle, and is in the form of a iDlate, ovate and 

 ciliated at and near the tip, where it is obtuse ; the sides are nearly 

 parallel, and it is surpassed by the iu?opods, which consist, on each side, 

 of a large basal segment, carinated on the outer side and toothed at 

 the articulation with the outer ramus, obliquely truncated at the end, 

 where it bears a short, obtusely-triangular, ciliated, inner ramus, or 

 lamella, in the same plane as the basal segment. The outer ramus, or 

 lamella, forms nearly a right angle with the basal segment, and stands 

 upon its superior outer margin. This ramus is elongate reniform in out- 

 line, being notched below for the tooth on the basal segment, and is 



