D978 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
DESCRIPTIONS OF THE LAR 
IL—NEREIDIFORMEA. 
SYLLID®. 
Three species of undoubted Syllid larvae have been 
found. As these closely resemble each other in general 
features, they may be treated together and distinguished 
when necessary as Sylids A, B, and C respectively. It 
is impossible to determine even the genus of any one of 
them. 
Metatrochophore.*—Two specimens (one of 
sp. A, the other of sp. C) are in the second metatrocho- 
phore stage, but I have not had the opportunity of 
examining them alive. No earlier stage than this has 
been seen. ‘These two larvae are pear-shaped (about 
350 long by 2504 maximum diameter), with the proto- 
troch (or “preoral” ciliated band) in the position of 
greatest breadth. There is a narrow ciliated tract round 
the mouth; and the akrotroch and one pair at least of the 
eyespots seen in living specimens of the Nectochaeta of 
species A are probably also present, in that species at 
any rate.t 
* The technical terms commonly adopted in describing the different 
stages, larval organs, etc., found during the development of Annelids 
are those defined by Hacker (1897, pp. 74-76). Most of these terms 
require no alteration to render them suitable for English use: the 
term ‘‘ Zwischenparatroch’’ has, however, been replaced by 
‘‘Interparatroch,’’ and the term ‘‘Endparatroch’’ by the less 
awkward and equally well known term ‘‘ Telotroch.’’ In addition to 
the terms defined by Hacker I have found it convenient to distinguish, 
with Claparéde (1863, p. 87), between amphitrochal, nototrochal and 
gastrotrochal segmental ciliated bands according to whether they 
completely encircle the body or are confined to the dorsal or to the 
ventral surface. In addition I have used the term ‘‘ Neurotroch ”’ to 
designate the longitudinal ciliated tract frequently found between 
the mouth and anus. Definitions of all these terms will be found in 
my ‘‘ Studies on Polychaet Larvae’’ (Gravely, 1909, pp. 597-600). 
+ See footnote to Nectochaeta stage below. 
