of the Fishery Board for Scotland. 



149 



1. (Figs. 48, 58, and 60.) In this stage the first maxillipede has 

 altered considerably. The protopodite joints are no longer distinct. 



The exopodite is 3-jointed. It is furnished with four terminal 

 setae and a hair close to the tip. The " elbow " joint is not a movable 

 one. 



The endopodite (Fig. 60) has a peculiar form. It is twisted on its 

 long axis, and has a flat broad extremity upon which there are eight 

 short smooth hairs. Its inner edge bears three short hairs, of which 

 two are plumose. 



The protopodite lobes (Fig. 58) are now long and narrow. They are 

 profusely supplied with spines, of which three of different kinds are 

 shown in Figs. 56, 62, and 63. 



The epipodite has more filaments. Of these 13 are on the outer edge, 

 four on the inner edge of the proximal half, and one on the surface of 

 the latter. On the heel " there are three stout serrated hairs. 



Second Maxjllipede, 2 mp, Plates viii. (Fig. 51) and ix. 



I. (Figs. 68, 76, 83 and 85). The second maxillipede resembles the 

 first maxillipede, but differs from it in the size of its endopodite. 



It has the 2- jointed protopodite, a 2 -jointed exopodite which bears 

 four plumose setse, and a 3-jointed endopodite. 



On the long protopodite joint (the second) there were on the inner 

 edge four hairs, of which two had a few cilia. 



The endopodite (Fig. 83) bears on each joint a strong serrated spine, 

 that of the third joint being the longest, while that of the first is the 

 shortest. On the end joint there is in addition a long slender hair 

 and three shorter hairs. The former and one of the latter show a 

 single serration each. 



The hair formula was, 0:4:1:1:5. 



On the first joint of the protopodite a rudimentary epipodite was 

 made out (ejo. Fig. 85). 



II. (Fig. 51). In this stage there is little that calls for special 

 mention, except that the hairs and spines are with one exception all 

 serrated. 



The exopodite has six plumose setse. 



III. (Fig. 65). The endopodite showed on its last joint six hairs 

 (Fig. 70), i.e. one more than in the two preceding stages. 



The endopodite has eight plumose setae. 



TV. (Fig. 66). In this case the same number of hairs was found on 

 the endopodite as in the I and II. Zoeae. 



The plumose setse of the exopodite are now ten in number. 



The epipodite {ep) on the first joint of the protopodite is now large, as 

 is also another process which is a branchia (6r). 



Megalops (Fig. 64). The protopodite is 2-jointed, and from the first 

 joint arise a branchia (hr) and the epipodite \ep). It is probable that 

 another branchia is present, but it was not made out. The protopodite 

 joints are broad and short. The second is the homologue of the long 

 second joint in the Zoea. 



The exopodite is 2-jointed, and the second or distal joint shows a 

 line of segmentation across it. At the elbow there is a thickening of 

 the integument, probably strengthening. The exopodite has four 

 plumose setse. 



The endopodite is 5-jointed and bent. The last two joints are armed 

 with stout serrated spines. On the fifth joint there are five serrated 

 spines and two smooth hairs, on the fourth two serrated spines and one 

 smooth hair, and on the third and second joints one smooth hair 

 each. 



