. Fig. 14. Reconstruction from a series transverse to the nerve ring of a slice in the region of the mandibular outflow to show the nerve supply to the adductor muscle, adductor muscle, anterior hypo- stomal apodeme; adductor tendon; anterior cardiac nerve; nerve to adductor muscle; branch of visceral nerve leading to labral glands; anterior motor mandibular nerve; posterior motor mandibular nerve; sensory mandibular nerve leading to mandibular basal ganglion; hinder (tritocerebral) region of nerve ring; shel
. Fig. 14. Reconstruction from a series transverse to the nerve ring of a slice in the region of the mandibular outflow to show the nerve supply to the adductor muscle, adductor muscle, anterior hypo- stomal apodeme; adductor tendon; anterior cardiac nerve; nerve to adductor muscle; branch of visceral nerve leading to labral glands; anterior motor mandibular nerve; posterior motor mandibular nerve; sensory mandibular nerve leading to mandibular basal ganglion; hinder (tritocerebral) region of nerve ring; shell nerve; visceral nerve; oes. oesophagus; tendon of dorsoventral body retractor; v. muscle controlling valve in supraneural blood vessel. a relatively small basal ganglion near its base. Behind this the nerves appear to vary considerably and run to the various muscles connected with the caudal furca. I have not followed them in detail. The ventral chain system consists of two parallel trunks which swell up in places and make various cross connexions. Liiders (1909, p. 138) states that there are four commissural connexions and these indicate that this chain system is primitive and represents the type of nervous system only found in the Crustacea among certain 6-2
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