POLYCHAT LARV.2E. Dsl 
of parapodia, and are 500 in length by 150,» in breadth. 
Though possessing fewer segments than the oldest 
specimen of Syllid A described above, the tentacles and 
dorsal cirri are much more fully developed; all three 
cephalic tentacles are present, though very short—the 
median one especially so. A pair of broad, but slightly 
developed, lobes, situated at the sides of the head imme- 
diately in front of the prototroch, represent the 
developing palps. | 
The dorsal peristomial cirri are longer than the 
ventral, but shorter than the dorsal cirri of the second 
(first chaetigerous) segment, which lhkewise exceed in 
length those of the succeeding segments. As in Syllid A, 
however, the rami of the parapodia of the second segment 
are shorter than those of the third. The parapodia of the 
fourth and succeeding segments only, each bear, close to 
their distal extremities, a short ventral cirrus. Anal 
styles are not present, but may have been shed at death. 
The only other larva of this species that has been 
seen is much longer in proportion to its breadth, on 
account of the presence of two additional segments which 
have developed unaccompanied by any increase in 
breadth. The parapodia, with their dorsal cirri, are 
shorter than in the younger specimens, probably through 
contraction; their lengths relative to each other, how- 
ever, remain the same, with the parapodia of the first 
chaetigerous segment shorter than those of the second. 
The ventral cirri are slightly more developed than in the 
younger larvae, and are still absent from the first two 
pairs of chaetigerous appendages. Anal styles are 
present and of considerable size. | 
Syllid © (PI. I., fig. 4). Only a single specimen has 
been found, and that in an earlier stage than any of the 
other Syllid larvae. It is characterised by the rounded 
