590 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
behind the prototroch. In the late stage seen in fig. 2 of 
the same plate—a stage remarkably lke the post-necto- 
chaeta stage of the Port Erin larvae—small tufts of cilia 
are described as occurring at the bases of the paired 
cephalic tentacles and palps. 
McIntosh (1900: pp. 321-525; Pl. XXVIa, figs. 3-8, 
10, and 12) describes and figures the pale greenish larvae 
of Harmothoé wmbricata. He also (1900: p. 413) describes 
a larva, referred to a species either of Sthenelazs or 
Stgalion, with bluish anterior digestive organs in the 
metatrochophore stage; whilst the larvae of Philoe 
minuta (described on p. 441) and of several unidentified 
species of Polynoidae (one described on pp. 325-6) are 
figured in the same work on Pl. XXVIa._ Claparéde 
has also described and figured Polynoé larvae (1863: 
pp. 80-81; Pl. VIII., figs. 7-11). 
PHYLLODOCID®. 
Three kinds of larvae belonging to this family have 
been obtained. They all exhibit the same characteristic 
general appearance, but may be distinguished from each 
other by differences in the setae, and species A is of much 
smaller size than either of the other two. 
Phyllodocid A.—J/yst¢des—(P1. II., figs. 6-7.) * 
Trochophore.—this larva is very much com- 
moner (during July) than either of the larger species. The 
Trochophore is of a pale brown colour and is extra- 
ordinarily contractile. When fully extended, the region 
in front of the prototroch is slightly longer than the 
region behind it, and the outline is roughly elliptical 
(Ply 9h) ie. 6)5/2 witen | tally contracted the larva 
becomes broader than it is long, the transverse axis 
