124 
a. 
anastm. 
RR 
ceb. 
cir. 
cir. ta, 
cl. etl, 
el. sns. 
con't, lg. l. 
c so, 
cta. 
dřsep. 
Jor. 
Sor. mot. 
foran. 
gn. coms. 
gn. pa pd. 
gn. sb-e. 
coms, CrC-@, 
con't. lg. m. 
BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
EXPLANATION OF PLATES. 
ABBREVIATIONS. 
Anterior. gn. sg. 
Anastomosis. h’drm. 
Axis cylinder. mu. 
Brain. mu. ere, 
Dirrus. mu. lg. 
Tentacular cirrus. mu. ob, 
Jiliated cell. n. 
Sensory cell. ned, 
Circum-cesophageal com- n’gli. 
missure. nl. 
Lateral longitudinal con- wlem. 
nective. n’ pil. 
Median longitudinal con- n. pa-coms, 
nective. oc. 
Centrosome. p 
Cuticula. po. sq. 
Dissepiment. rel, 
Fibrillations, sq. ce. 
Motor fibres. set. 
Nerve fibres. sul. cil. 
Commissural ganglion. tu. for. 
Parapodial ganglion. Weds 
Sub-osophageal ganglion, 
va, SNJ. 
All Figures, except 1, 5, 8, 27, and 39, were outlined with the camera lucida. 
Figures 28-30 and 82-41 were drawn from methylen-blue preparations. 
Segmental ganglion. 
Hy podermis. 
Muscle fibres. 
Circular muscles. 
Longitudinal muscles. 
Oblique muscles. 
Nerve. 
Giant fibre. 
Neuroglia. 
Nucleus. 
Neurilemma. 
Neuropil. 
Para-commissural nerve. 
Eye. 
Posterior. 
Pore of segmental organ. 
Reticulum. 
Cephalic segment, 
Seta. 
Jiliated groove. 
Fibre sheath. 
Tunica intima. 
Blood-vessel, 
