G\IGANTO'CYPRIS MULLERI 



227 



body wall, which I deal with later. It is figured by Liiders and erroneously described 

 as supplying the muscles of the vibratory plate of the maxilla. Close behind this again 

 is the double root of a long nerve which runs to the second trunk limb and ends in 



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, add.m. adductor muscle, a.h.a. anterior hypo- 

 stomal apodeme; a.t. adductor tendon; n.a.c. anterior cardiac nerve; n.add.m. nerve to adductor muscle; 

 n.l.gl. branch of visceral nerve leading to labral glands; n.mdb.a.m. anterior motor mandibular nerve; 

 n.mdb.p.m. posterior motor mandibular nerve; n.rndb.s. sensory mandibular nerve leading to mandibular 

 basal ganglion; n.r. hinder (tritocerebral) region of nerve ring; n.sh. shell nerve; n.visc. visceral nerve; 

 oes. oesophagus; t.m.b.r. 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 



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