648 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION. OF PLATES. 
Except where otherwise stated, the figures have been drawn 
in outline with the aid of a camera-lucida from stained specimens 
mounted in Canada-balsam; and modifications and additions 
have then been inserted from rough sketches of the living larvae, 
made in the laboratory at Port Erin. 
REFERENCE LETTERS. 
Akr. = Akrotroch. Ph. = Pharynx, orits radiments. 
An. Sty. = Anal style. Post. = Posterior masses of deeply 
Ant. = Anterior mass of deeply staining tissue (first tissue to 
staining tissue (brain rudiment). show signs of segmentation). 
C. ap. = Apical cilia. Pr. = Prostomium. 
C. or. = Oral cilia. Ptr. = Prototroch. 
Cir. 7., 1., 7. = Tentacular cirri S. = Setae. 
ofsegments one, two and three. T. = Tentacle. 
De: Ttr. = Telotroch. 
M. = Mouth. 1., 11., Wit., etc. = Primary segments 
Nir. = Neurotroch. * number one, two, three, etc. 
N.b.—It will be noticed that figures 1 to 14 have been 
distributed, a few at the foot of each of the four plates. 
Prats L[. 
g. 1. Syllid A—Metatrochophore, dorsal aspect. .x 75. 
The eye-spots and cilia as seen during life (and as 
shown here) have only been-seen in a more 
advanced specimen. 
Fig. 2. Syllid A.—Setae: (A) Simple seta; (B) Compound 
seta. 
Fig. 3. Syllid B—Setae (A and B) Simple setae; (C) Com- 
pound seta. 
Fig. 4. Syllid C.—Setae. (A) Simple seta; (B) Compound 
seta. 
