rr 
— 
Fig. 
Wig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
g. 
POLYCHAT LARVZ. 649 
5. % Sylld.—Optical section. 75. (From a mounted 
specimen only.) 
15. Polynoé.—Trochophore seen from the right side. > 75. 
C., long motionless cilia; Caec., dorsal lobe of 
stomach. J’. med., median tentacle (rudiment). 
15a. Outline of ventral surface of the same larva as fig. 15 
to show more clearly the distribution of the cilia. 
16. Polynoé.—Metatrochophore, dorsal aspect. x 75. 
Hi., elytra. 
17. Polynoé.—More advanced Metatrochophore, ventral 
aspect. x 75. Hl., elytron. T. med., median 
tentacle (rudiment). 
18. Polynoé.mHead of Nectochaeta, dorsal aspect. 
<x 75. T. lat., lateral tentacle; 7. med., median 
tentacle. 
19. Polynoé.—Anterior end of one of the most advanced 
pelagic stages, dorsal aspect. x 75. 4HI., elytron., 
J.,jaws; P.,palp; T. lat., lateral tentacle T. med., 
anceghern tanta. 
90 A and B. Two views of a seta from the ventral tuft of a 
Polynoé larvae. 
Di: Bumeid lamwa. <1). 
PLATE IT. 
6. Phyllodocid A.—Trochophore; seen from the right 
side. x 75. Akr., T-shape akrotroch; Med. Hk., 
its median “hook” of cilia; Nér., Neurotroch— 
expanded laterally to cover a large area in the 
particular region indicated by the letters. 
7. Phyllodocid A.—Anterior end of Nectochaeta, dorsal 
aspect. xX 70. 
Ta. Phyllodocd A.—Seta. 
8. Phyllodocid E_tieetee ventral aspect. 
x 75. (From a mounted specimen cnly.) 
9. Phyllodocid B.—Seta. 
