of the Fishery Board for Scotland. 



151 



future epipodite, the large proximal swelling represents two branchiae. 

 No segmentation into joints was seen. The limb is a hollow process, 

 and the swellings are also hollow. 



II. (Fig. 84). Three swellings are now to be made out on the outer 

 side of the growing bud. The upper represents the epipodite, the other 

 two, branchiae. 



III. (Fig. 74). 



lY. (Fig. 67). The endopodite is a 3- jointed branch. The epipodite 

 lep) is large, and the two gills are seen to be hollow swellings. 



Megalops (Figs. 81, 86, and 87). The appendage is now functional. 

 There are two basal joints, the first a thin joint, the second is a large 

 joint bearing the epipodite. Attached to the upper part of the first 

 joint, or probably actually in position as arthobranchs, there are the two 

 branchiae, not yet functional, however. Above the base of the epipodite 

 there is a small process which is probably the future podobranch. 



The epipodite {ep) has eight long stiff filaments, which are curved at 

 their tips. They are with one exception on the outer edge of the epi- 

 podite. On the beginning of the epipodite there are three plumose 

 hairs. 



The large basal joint is adorned with a row of six plumose hairs. 



The exopodite is 3-jointed and bears four plumose setae at its 

 extremity. The exopodite is bent, and the "elbow" joint is strengthened 

 by a thickened chitinous plate on the external angle ; it appears to be 

 rigid. 



The endopodite is 5-jointed, and is bent on itself. The first joint is 

 a long flat joint, broader distally than at the proximal end (Fig. 97). 

 Its internal edge is a little irregular, and it has three little angular 

 projections. It is furnished with short hairs, of which some are ciliated ; 

 they are mainly located on the edge : a few are surface in position. The 

 second is a broad rounded joint, narrower than the distal part of the 

 first joint. It is provided with a number of hairs, of which two are 

 serrated (Fig. 81). The remaining three joints are armed with serrated 

 bristles, the terminal one of which is very long and stout {ih. and Fig. 

 77). All the serrated bristles are on the anterior or upper surface, that 

 is, next the second maxillipede. There is a considerable amount of free 

 movement in an antero-posterior plane at the joint between the second 

 and third segments. The other joints give little or no movement. 



1. (Figs. 88, 98, 103). In this stage no important difference from the 

 preceding stage is noted. The three branchiae are present, two of the 

 branchiae are lobed. The epipodite has an increased number of filaments. 

 The basal joint and the proximal end of the epipodite are adorned 

 on the posterior surface with, in the case of the former, two rows, and 

 in the latter, one row of plumose setae. Alongside the plumose setae 

 there is a row of little thorn-like teeth. 



The exopodite (Figs. 88 and 98) is 3-jointed, and has five plumose 

 setae. On the inner edge of the exopodite there is, near its distal end, 

 a notch. The exopodite moves about on the superior or anterior surface 

 of the endopodite, and this notch, into which the hind edge of the 

 second joint of the endopodite fits, prevents the exopodite from moving 

 too far over the endopodite. There is in the adult a similar notcn 

 on the exopodite of the third maxillipede : it is accompanied by a 

 tuft of hairs. 



Two drawings of the endopodite are given ; one, (Fig. 98) represents 

 the upper or anterior surface, the other (Fig. 103) shows the posterior 

 or ventral surface. The latter is covered over with minute needle-point 

 cilia, which have been already noticed as parts of the antennule and 

 antenna in this stage. On the third, fourth, and fifth joints of the 



