124 
BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
EXPLANATION OF PLATES. 
All Figures, except 1, 5, 8, 27, and 39, were outlined with the camera lucida. 
Figures 28-30 and 32-41 were drawn from methylen-blue preparations. 
a. 
anastm. 
ax. cyl. 
ceb. 
cir. 
cir. ta. 
el. cil. 
cl. sns. 
coms. Crc-@. 
con’t. lg. 1. 
con’t. Ig. m. 
c’so. 
cta. 
di’sep. 
Sor. 
Sor. mot. 
Sor. n. 
gn. coms. 
gn. pa’pd. 
gn. sb-e. 
ABBREVIATIONS. 
Anterior. gn. sq. 
Anastomosis. h’drm. 
Axis cylinder. mu. 
Brain. mu. ere 
Cirrus. mu. lg 
Tentacular cirrus. mu. ob 
Ciliated cell. n. 
Sensory cell. n’cd 
Circum-cesophageal com- n’gli. 
missure. nl. 
Lateral longitudinal con- nlem 
nective. n’pil 
Median longitudinal con- n, pa-coms. 
nective. oc. 
Centrosome. p: 
Cuticula. po. sg. 
Dissepiment. rtl. 
Fibrillations. Sg. Ce. 
Motor fibres. set. 
Nerve fibres. sul. cil. 
Commissural ganglion. tu. for. 
Parapodial ganglion. tu. t. 
Sub-cesophageal ganglion, 
va. sng. 
Segmental ganglion. 
Hypodermis. 
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. 
Ciliated groove. 
Fibre sheath. 
Tunica intima. 
Blood-vessel. 
