REPORT ON THE AMPTIIPODA. 875 



bent; the limb also similar, but in all parts larger, the chief difference of shape being 

 in the hand, which has a well-defined palm, the border of which turns at first almost 

 at right angles to the spine-beset hind margin, then forming a great cavity by its 

 junction with a large triangular process which projects just below the hinge of the finger ; 

 over the end of the triangular process and the outer part of the cavity the broad finger 

 bends, resting its tip among spines on the inner surface above the commencement of 

 the palm ; some strong spines are set near the commencement of the palm, while the 

 cavity and the process above mentioned arc fringed with setules. 



First Perseopods. — Side-plates longer and less pointed than in the preceding pair 

 The limb similar to the following pair. 



Second Perseopods. — The side-plates longer than in the preceding pair ; the 

 surface vertically ridged or raised in this as in the two preceding pairs ; the front 

 margin straight, the hinder excavate just at the top, then sloping forwards to the 

 narrow lower margin. The branchial vesicles broadly oval, shorter than the first joint 

 of the limb. The first joint not reaching the end of the side-plate, its front margin 

 fringed with setiform spines of various lengths ; the second joint comparatively long ; 

 the third much longer than the fourth, with spines at two points of the hind margin 

 and at the apex, which has a little lobe, spines at two or three points of the front 

 margin and at its long, acute, decurrent apex. The fourth joint like the third 

 widening distally, shorter than the fifth, with three groups of spines on the serrate 

 hind margin and a large group round its apex, the front margin free, its apex pointed ; 

 the fifth joint shorter than the third, somewhat curved, almost parallel-sided, with 

 spines at five points of the hind margin, some spinules on the front ; the finger curved, 

 considerably shorter than the fifth joint ; dorsal cilium short, near the hinge ; two or 

 three more cilia on the hind margin and at the base of the nad. 



Third Perwopods. — The side-plates broader than the preceding pair, strongly 

 bdobed, the hind lobe narrower, but considerably deeper than the front one, distally 

 pointed. The branchial vesicles much as in the preceding pair ; the whole series is 

 very uniform in shape, graduated in size, so that the central pairs are the largest ; 

 none are very large, all inflated, and more persistent than usual ; whether the last 

 perasopods had any I did not perceive. First joint of the limb oblong, broader below 

 than above, the lower hinder lobe overlapping the second joint ; the front margin with 

 spines at a few points, the hind margin almost smooth, sinuous, but all the central 

 part concave ; the upper surface is longitudinally ridged ; the second joint has spines 

 at two points in front ; the remaining joints are like those of the preceding perseopods 

 in shape and armature, but are thicker and stronger, the fifth and sixth joints also a 

 little longer ; the third has spines at five points in front, the fifth at six points, and 

 the finger six cflia on the outer niar°in. 



Fourth Perseopods. — The side-plates with an inconspicuous lobe in front, the hind 



