650 
Fig 
Fig. 
Fig. 
Fig. 
TRANSACTIONS. LIVERPOOL BIOLOGICAL SOCIETY. 
22. 
23. 
25. 
5. 20: 
27. 
ig. 28. 
es 
. 30. 
Spionid A.—Anterior end of one of the most advanced 
larvae seen, dorsal aspect. x 60. (From a 
mounted specimen only.) 
Spiomd A.—First parapodium of the left side of the 
above larva. x 80 (diagrammatic; the full 
length of the long notopodial provisional setae is 
not shown). 
Spionid A.—Second to third parapodium of the left 
side of the above larva. x 80 (diagrammatic). 
Spiomd A.—Left parapodium of one of the 4th-6th 
segments of the above larva. > 80 (diagram- 
matic*). 
Spiond A.—Left parapodium of one of the Tth-l1th 
segments of the above larva. x 80 (diagram- 
matic™), 
Spiomd A.—Parapodium from a larva in the stage 
before the differentiation of the parapodia of 
segments 7-11. 
Polydora A.—Nectosoma, dorsal aspect. Xx 75; stage 
at which the tentacles first become visible—in the 
figure they are obscured by the prototroch. The 
seta and the cilia have been omitted in part in order 
that the pigmentation may be more clearly seen. 
Polydora A.—Anterior end of a more advanced Necto- 
soma, dorsal aspect. 75. (From a mounted 
specimen only.) 
Polydora A.—Setae. (A) Left side of the specially 
modified 5th segment with its setae; dorsal 
aspect; (B) Crotchet (hooded? ); more highly 
magnified than (A). 
¢ Polydora.—Seta. 
Polydora B.—A segment from about half way along 
the body, to show the arrangement of the pigment ; 
setae and cilia not shown. 
* The spherical projection between the rami is not present on all of 
these parapodia, and its outline has, therefore, been indicated in figs. 25 
and 26 by a dotted line. 
