146 Part III.—Twenty-first Annual Report 
lobe there is a short plumose seta, and on the inferior edge a short plain 
hair. 
IIT. (Figs. 35 and 38). The condition is similar to the preceding. 
The little plumose hair which is seen on the outer edge of the upper 
lobe is shown in Fig. 12. 
Fig. 15 is an enlarged drawing of the palp. 
IV. (Figs. 13 and 36). In this stage one spine more was found 
on the upper lobe, and one fewer on the lower lobe than in ITI, 7.e. ten 
on the upper and seven on the lower. 
Tn the specimen dissected the two first maxille were not alike. The 
palp of one side was normal (Fig. 13), while the palp of the first maxilla 
of the other side had a single hair attached to the middle of the 
second joint (Fig. 36), in this recalling the structure of the palp of 
the first maxilla in the Megalops of Crangon vulgaris. 
Meeavoprs (Fig. 47). The first maxilla in this stage retains a general 
resemblance to the Zoéa condition. It is 2-jointed. From the basal 
joint rises a narrow lobe. The second joint forms a large lobe, on the 
outer side of which there is the palp. Except for an increase in the 
number of spines on the two lobes their armature has not changed 
much. 
The palp, however, is now a single-jointed flattened appendage, which 
is bent on itself. 
In this specimen also the two first maxille differed, viz. in the 
number of spines on the lobes. 
1. (Fig. 42.) The palp is now 2-jointed. The first joint is broad and 
peculiarly shaped ; it bears two smooth hairs at its middle. The second 
joint is bent down away from the lobes, and carries two terminal 
smooth hairs. 
The armature of the two lobes is shown in the sketch. 
Second Maxinia, 2m, Plates viii. and ix. 
’ The second maxilla consists of two joints, vide Fig. 55, which shows 
the appendage in the IV. Zoéa. The first joint (prot. 7b.) has a long 
lobe (2') attached to it. This appears to be simply a process of the first 
joint, not segmented off from it. The upper joint is cleft into two lobes 
(2", and Z'’'). To its outer edge is attached the scaphognathite which is 
the homologue of the palp in the first maxilla. There is then in the 
second maxilla a condition similar to that of the first maxilla. Gurney 
in his drawing of the second maxilla in the I. Zoéa of Corystes indicates 
a condition resembling that described above. It is possible that the top 
lobe (2"’) is the endopodite, but in none of the stages was it seen to be 
segmented off. 
I. (Figs. 45 and 76). The endognath then consists of three lobes, of 
which the two upper form the large lobe, and the third the small lower 
lobe. Each lobe bears on its inner edge a number of bristles, which are 
grouped on sub-divisions of the lobes. The spines on the upper double 
lobe are long stiff hairs, some of which are provided with a few long lanceo- 
late cilia, others are minutely serrated on their distal halves (Figs. 44 
and 54). On the lowest lobe the spines are adorned with long 
lanceolate cilia (Fig. 50). The spine formula is (5 + 3:4 +4 5): (4 
+ 3). Certain of these resemble spines that are found on the first 
maxilla. 
On the upper and lower edges of the lobes there are groups of 
delicate cilia. 
The scaphognathite is small and bears five long plumose sete. The 
same aumber was found by Gurney in Corystes and by Mortensen in 
Palemon Fabriati. In Crangon vulgaris also there are five sete. 
