476 EXPLANATION OF THE LETTERING. 



g.h Cephalic gastro-hepatic gland. 



g.i Intraganglionic infolding of the middle cord. 



g.iv Invagination for optic ganglia. 



gm.c Germ cells. 



g.n.c Gustatory nerve roots. 



g.o Gustatory organs; genital organs. 



g.p Gular plates. 



gr Groove between olfactory organs. 



gt.p Gut pouch. 



g.tr Gustatory tracts. 



gust.n Gustatory nerve. 



gust.o Gustatory organ. 



g.w Germ wall. 



h Hypodermis. 



h'~^ Bony plates covering the hyoid arches. 



H.as Hemisphere association cells. 



H. as.tr Hemisphere association tracts. 



h.c Haversian canals; hepatic caeca. 



he Hydroccele. 



h.co Haemal commissures. 



h.l Haemal lamina of cephalic shield. 



h.m Hyo-mandibular. 



h.m.n Hyo-mandibular line of canal organs. 



h.n.c Haemal nerve cord. 



h.ne.n Haemo-neural nerve. 



h.n.m Haemo-neural muscle. 



h.pr Haemal processes. 



h.r'"5 . . Haemal roots. 



h.ri Horn ridges. 



h.s Tergal plates of the abdominal half -segments. 



hst Haemostoma. 



ht Heart. 



h.tr Haemal tracts. 



hy Hyoid. 



hyp Hypophysis. 



i Intestinal nerves (i-io). 



i.ent Inter-entapophysial muscle. 



g' Inter-ganglionic infolding of the middle cord. 



i.g.s Inter-ganglionic spaces. 



.l.m Gill muscle. 



.n.l Inner neurilemma; neuroglia. 



int Intestinal nerve. 



.og Post-oral or mesocephalic neuromeres. 



.0.1 Infra-orbital line of canal organs. 



.p Internal pores. 



.pi Intestinal plexus. 



.r Transverse ridge-plate on inner surface of the premaxillae 



.sh Inner neurilemma sheath. 



.V Infoldings leading to neural canal. 



iv.l.e.g Invagination for lateral eye-ganglion. 



iv.ol.l Invagination for olfactory lobes. 



