600 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
McIntosh’s larvae being very much smaller* than even 
Species A of the Port Erin Phyllodocids. Agassiz (1867: 
pp. 249-252; Pl. VI., figs. 46-55) describes the later 
development of this species. Huis youngest larvae (his 
figs. 46-47) already bear a pair of eyes and one pair of 
short cephalic tentacles. The first three body-segments 
—i.e., those that ultimately bear tentacular cirri—are at 
first much larger than the rest, which they overlap as a 
“shield.”  Greef (1879: pp. 250-6; Pl. XViieiteemeoes 
also describes a Phyllodocid larva with a “ shield.” 
Hacker (1896: pp. 84-6; Pl. IDE} aesiae 
describes a short row of cilia just behind the eyes of his 
Naples Phyllodocid larvae in the trochophore and meta- 
trochophore stages, stating (p. 85) that these are 
characteristic of Phyllodocid larvae generally, and serve 
amongst other characters to distinguish them from the 
larvae of Polynoé and of Nephthys. I have been unable 
to detect these in the Port Erin Phyllodocid larvae, 
whereas they are certainly present in Polynoid larvae 
(see above, p. 586). 
I have already referred (see above, p. 575) to Mr. 
James Hornell’s account of a Phyllodocid larva from the 
L.M.B.C. district. Other Phyllodocid larvae (all of them 
of the same general type as those from Port Hrin) have 
been described by Claparede and Mecznikow (1869: 
pp. 189-191; Pl. XV., figs. 2-2p), Hacker (18987 
pp. 11-12; Pl. 1., fig. 5), and Leschke (1908: pp. 1380-131; 
Pl. VII., figs. 3-5). McIntosh (1908: p. 45) briefly 
summarises the accounts given by some of the authors 
above referred to. 
* Specimens of the metatrochophore and nectochaeta stages of this 
species were abundant at Plymouth at Easter (1909), and I found 
them to be of quite a large size—about equal to that of Phyllodocids 
B and C. I have no doubt cf the identity of these larvae, which 
closely agreed with Agassiz’s figures, and which developed into small 
worms with all the characters of P. maculata ; there must, therefore, 
be a considerable amount of growth between the stages reared by 
McIntosh from the eggs of this species and the early metatrochophore 
stages seen at Plymouth. 
