38 
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Explanation of figures. 
a = area of visceral ganglion between dorso-central lobes and cerebro-visceral 
connectives in figs. 1,2. 
acc.g = accessory gangüon. 
i = pigmented body on dorsal surface of ventro-central lobe. fig. 2. 
Ir' = nerve fibres passing direct from cerebro-visceral connective to branchial nerve. 
Z>r" = nerve fibres from accessory ganglion which enter branchial nerve. 
hr.f = nerve fibres of the cerebro-visceral connective which enter the branchial nerve, 
Ir.n = branchial nerve. 
c.g = cortex of gangüon cells between d.c.l and v.c.l. 
c. v.con = cerebro-visceral connective. 
cut — cuticle. 
d. c.l = dorso-central lobes. 
g.c = cortex layer of gangüon cells. 
gl.f = neurogüa fibres. 
gl.n = neurogüa nuclei. 
1.1 = left lateral lobe of visceral gangüon. 
lat.gr = lateral groove of visceral gangüon. 
mus.n = muscle nerve roots. 
n.c = gangüon cells in branchial nerve. 
N.f = neurofibriUae. 
N.m = nuclear membrane. 
Nu = Nucleolus. 
OS = osphradial epitheüum 
os.n = osphradial nerve fibres. 
