106 MR. W. K. BROOKS ON LUCIFER: 



The first antenna (fig. 84, A) consists of a three-jointed shaft about as long as the 

 carapace, and two terminal flagella. The basal joint of the shaft makes half the total 

 leno-th of the appendage, and the other two are about equal to each other. On the 

 inner edge of the distal two-thirds of the shaft there are eight long, similar equidistant, 

 plumose hairs, and there are two short spines on the outer edge. The inner flagellum 

 is short, and carries one long slender terminal hair. The outer one is more than twice 

 as long, and carries two thick sensory hairs. 



The exopodite of the second antenna (fig. 84, ex) has become a scale, only one-third 

 as long as the endopodite, which is now a ten -jointed flagellum about as long as the 

 carapace. 



The second and third maxillipeds (fig. 84, Mp. 2 and Mp. 3) and the first, second 

 and third pereipods (fig. 84, T I, T -2, and T 3), are Schizoped-like, but they are of very 

 slight functional importance, and their endopodites are folded forwards on the ventral 

 surface, like the maxillipeds of Squilla, so that it is impossible to study the mouth 

 parts without dissection. The endopodite of the fourth pereiopod has entirely 

 disappeared, and the limb is represented only by its exopodite. The five exopodites 

 are about alike, and they all end in long slender swimming hairs : those of the four 

 pereiopods (T 1 ex, T 2 e'x, T 3 ex, and T4 ex) are bent outwards and upwards towards 

 the dorsal surface, as in the maxillipeds of a Crab Zoca, but those of the second and 

 third maxillipeds (Mp. 2 ex and Mp. 3 ex) are more nearly parallel to the endopodites. 

 The endopodite of the second maxilliped (Mp. 2) is free and movable, but those of the 

 third maxillipeds (Mp. 3) and of the first, second, and third pereiopods are covered by 

 a delicate cuticle, and are almost immovable. 



I did not actually witness the next moult, but four days later the larva, ToW i ncn 

 long, was in the stage shown in fig. 85. The exopodites of the thoracic limbs have 

 become reduced to rudiments, the limbs themselves have stretched out and are now 

 functional, as are the three pairs of abdominal feet. 



The first antenna (fig. 86) has not changed much, but its base is swollen and the 

 otocyst has appeared. 



The second aiitenna is now half as long as the whole body, its flagellum is ten- 

 jointed, and red pigment has appeared at its base and tip (fig. 87). The outer end of 

 the scale carries nine long plumose hairs arranged on the tip and inner edge. 



The second maxilliped (fig. 88, Mp. 2) is bent into a knee, and is fringed by sixteen 

 plumose hairs. Its exopodite is rudimentary, but longer than in any of the appendages 

 which follow. 



The third maxilliped (fig. 88, Mp. 3) is long, slender, six-jointed, with a rudimentary 

 endopodite. 



The other three limbs (fig. 88, T 1, T 2, T 3) are six-jointed and they end in enlarged 

 chela?. The first is the shortest ; the second is about as long as the third maxilliped, 

 and the third is still longer. The fourth is now represented only by a small rudiment 

 and a ganglion ; and the fifth is entirely absent, as it has been at all stages. 



