104 MR, W. K. BROOKS ON LUCIFER: 



appendage, and it carries four terminal hairs, two of them about as long as those on 

 the terminal joint of the shaft, and two nearly three times as long. 



The second antenna is the chief locomotor organ, and (as shown in fig. 77, An) it 

 consists of a thick two-jointed basal portion, which carries a two-jointed exopodite (ex) 

 and a ten-jointed endopodite (en). 



The proximal joint of the exopodite is about twice as long as the terminal joint, and 

 it carries two long hairs on its outer end, and two more near the base. The terminal 

 joint has, at its tip, one short hair, and four which are about as long as the limb. The 

 endopodite consists of four short rings, and a series of six joints like those of the 

 corresponding organ of the Nauplius, Protozoea, and Zoca of Lucifer. The terminal 

 joint carries four, and each of the five other joints one long swimming hair, and none 

 of these hairs are plumose. 



On the basal portion of the appendage there is a large bright-red pigment-spot, 

 which forks and runs along the exopodite and endopodite, about half way to their 

 tips. 



The labrum (fig. 77, L) is smaller than that of Lucifer, with a spine and a large red 

 pigment-spot. 



The mandible (fig. 77, M, and fig. 80) has small irregular denticles along its cutting 

 edge, and these reach to the tip of the long tooth which occupies the posterior angle 

 of the blade. The mandibles of two specimens were dissected out, and in each case 

 there was a little hairy pad (in) upon the posterior surface. It could also be seen 

 in the entire animal (as shown in fig. 77). It is possible that this pad is the man- 

 clibular palpus, but it seems much more probable that it is half of the lower lip or 

 metastoma, for no palpus is present on the mandible of Lucifer. 



The first maxilla (fig. 77, MX. 1, and fig. 81) is quite different from that of Lucifer 

 (fig. 46) at the same stage, but the difference is in minor points, and there is essential 

 agreement in general structure. The two basal joints or blades are long and slender, 

 and their hairs are also longer and thinner than they are in Lucifer. The endopodite 

 (en) is placed nearly at right angles to the base, and is distinctly three-jointed. It 

 carries five hairs as it does in Lucifer, and they are similarly placed, but longer. The 

 three hairs on the scaphognathite are about equal in length, and the plumules on 

 their sides are short and irregular. 



The second maxilla (fig. 77, MX. 2, and fig. 82) is much like that of the Lucifer 

 Zoea (fig. 47), but the three hairs at the tip are more than twice as long as those on 

 the inner edge of the appendage, and they are irregularly plumose, while they are 

 simple in Lucifer. 



The first maxilliped (fig. 77, Mp. 1, and fig. 83) differs from that of Lucifer (fig. 48) 

 in the same way, and the exopodite carries seven instead of four haii-s, and these are 

 as long as the appendage, and two-jointed. 



The second maxilliped (fig. 77, Mp. 2) is about as long as the first, but it does not 

 seem to be of much functional importance. It is usually carried stretched back along 



