596 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
already bears an eye, but these cannot be at all clearly 
distinguished in the mounted specimen. Lateral (pocket- 
like ?) thickenings of the oesophageal walls (rudiments of 
the thick-walled pharynx) are already present. The walls 
of the stomach are quite free from opaque granules, no 
food being, however, discernible in any part of the gut. | 
Metatrochophore I1—The only Metatro- 
chophore seen already bears rudimentary parapodia 
(Pl. IL, fig. 8). It is 650% in length) andi 
maximum diameter of 450”, which now coincides with 
the position of the yellowish prototroch; the periphery 
in front of, and to a less extent also behind, this band 
shows a yellowish coloration, but not nearly so con- 
spicuously as in the Trochophore. The preoral lobe 
bears a pair of conspicuous eyes on its dorsal surface. 
The mouth is still surrounded by cilia (Pl. Il., fig. 38, 
C. or.); but the thickenings of the walls of the oesophagus 
have fused together in the middle line in front of the 
mouth. 
Four pairs of tentacular cirri are present (one pair 
peristomial, two belonging to the second segment, and 
the fourth borne dorsal to the ramus of the first 
chaetigerous segment); they are all of about the same 
length (350). About ten further segments and a 
posterior unsegmented region are recognisable, each of 
the first six of these segments being provided with a short 
slender seta—either a simple capillary or the distal end 
only of a partially exposed jointed seta. Broad lobes, 
one above each chaetigerous lobe, represent the 
ultimately foliaceous dorsal cirri; anal styles are’ repre- 
sented by short lobes originating behind a narrow 
telotroch. 
Nectochaeta.—tThe last stage of this larva 
(that was seen) shows an increase in length to about 
