REPORT ON THE AMPHIPODA. 853 



curved spines, three accompanied with setae, the apical spine the longest ; the fifth joint 

 a little curved, with small incurved spines at three or four points on the hind and setae 

 at six points on the front margin, some of the latter being very long ; also at the 

 juncture with the finger behind, two very small spines curving outwards ; the finger 

 shorter than the fifth joint, somewhat boat-shaped, with smooth margins, an oval boat- 

 shaped cap projecting over and beyond the tip of the small nail. 



Second Perseopods. — Side-plates very broad, somewhat deeper than broad, a little 

 broader below than above, fringed round the lower margin with plumose setae of various 

 lengths. The branchial vesicles similar to those of the preceding pair, longer than the 

 first joint of the limb. The limb very similar to that of the first peragopods ; the first 

 joint reaching below the side-plate, with some long plumose setae on the upper part of 

 the hind margin ; the third joint with an apical group of setae on the front, and two or 

 three groups on the hind margin, this and the two following joints being rather shorter, 

 while the finger is rather longer, than in the first peraeopods ; the fourth joint with an 

 apical group of setae in front, and on the hind margin three long curved spines, each 

 attended by setae ; the fifth joint has setae at five points on the front margin, incurved 

 spines at three on the hind margin, and the apical pair of outcurved sjaines. 



Third Perasopods. — Side-plates broad and large, much broader than deep, with setae 

 on the lower margin, the front lobe larger than the hinder. The branchial vesicles some- 

 what larger than. the first joint of the limb, with a small accessory lobe at the base. The 

 first joint tending to an oval, rather broader above than below, with setae along the hind 

 margin, rather to be called prickly than plumose (which may also be said of those on the 

 various side-plates), also with setae on and near the front margin, and some that are very 

 long and plumose on the inner surface ; the third joint broad, not much shorter than the 

 first joint, and nearly as long as the fourth and fifth united, fringed with long spines or 

 spine-like setae along both margins ; fourth joint rather shorter than the fifth, with some 

 small groups of short and long spines in front, and an apical group behind ; the fifth joint 

 with two slender spines and a spinule on its straight front margin and four spinules 

 on the slightly curved hind margin ; the finger longer than the fifth joint, with a slight 

 constriction near the base, in which is inserted, not a cilium, but a seta ; the usual cap 

 over the short nail. 



Fourth Perseopods. — Side-plates lobed behind, with the lower margin serrate and 

 fringed. The first joint about equal in length to that in tlie third pair, broadest above, 

 with numerous setae along the front and hind margins, some long and densely plumose 

 (which are easily broken ofi") arising on the inner surface; the third joint longer than the 

 first, its margins fringed with numerous setae, some spine-like, some plumose ; the fourth, 

 fifth, and six joints similar to those of the preceding pair, but in each case longer ; the 

 fifth joint with three slender spines and a spinule on its front margin, in addition to the 

 little hinge-spines ; the seta at the base of the finger not observed, probably broken off. 



