﻿COPEPOU GENUS PUPULINA (CALIGOIDA) — WILSON 253 



wider than long, with small distal lobes; fourth legs attached near 

 the middle of the segment. Genital segment separate fi-om abdomen, 

 widened anteriorly, narrowed posteriorly, with cuticular lobes on the 

 sides at the midpoint ; behind these, another pair of lobes that repre- 

 sent the beginnings of the posterior processes. Ventrally, tliese latter 

 lobes carry the rudiments of leg 5, consisting of a small, rounded flap 

 hardly differentiated from the surface and bearing terminally two 

 short plumose setae; leg 6 not discernible in this specimen. Abdo- 

 men and caudal rami together only a little longer than the genital 

 segment. Abdomen showing no segmentation. Caudal rami flat- 

 tened dorsoventrally, with the plumose terminal setae longer than in 

 the adult. 



Ventrally, the fore part of the body showing the distinguishing 

 characters of the species already developed. The outer piece of the 

 first maxilla well extended distally ; both anterior and posterior ven- 

 tral accessory processes large and of distinctive shape, the posterior 

 process more membranous than in the adult, with the distal attenuated 

 point sharper. A pair of spinous processes between legs 1 and 2, 

 the connecting rod between them scarcely discernible. 



The second antenna segmented like that of the adult, but more 

 slender, the terminal claw very strongly bent as in adult ; prehensile 

 lateral hook comparatively shorter. The second maxilla not at all 

 strongly developed, the basal segment being shortened and not ex- 

 tending outward beyond the maxilliped as in the adult ; the terminal 

 claws (pi. 12, fig. 2, a) not demarcated basally from the apex, the 

 posterior claw very short, broad and dentate. 



Leg 1 with both rami 2-segmented and all setae present, the branch- 

 ing of the modified spine of the exopod incomplete. Rami of legs 

 2 and 3 only 2-segmented, the laminae not developed. Leg 4 rela- 

 tively small, consisting of the basal and two other smaller segments. 



Stage h (pi. 12, fig. 13) : Total length about 9.3 mm. Metasome a 

 little longer than urosome. Carapace slightly longer than wide. 

 Fourth legs attached near the distal end of free segment, the widened 

 area behind having disappeared; distal edges of segment somewhat 

 angular. 



Genital segment with processes reaching to about the proximal 

 third of abdomen ; rudiments of leg 5 on the ventral side having three 

 setae, one lateral, two terminal, all shorter than the two setae of the 

 preceding stage. Rudiments of leg 6, consisting of a very much ab- 

 breviated lobe and a single seta, located outside and slightly anterior 

 to leg 5. 



Abdomen 2-segmented dorsally, the short basal segment of the 

 adult indistinctly demarcated ventrally; the anal segment distally 

 with a pair of dorsal longitudinal lines, undoubtedly the beginnings of 



967612 — 52 2 



