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 1 " 2 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 Hae mo-neural nerve. 



h.n.m Haemo-neural muscle. 



h.pr Haemal processes. 



h.r 1 " 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. 



i.g . . Inter-ganglionic infolding of the middle cord. 



i.g.s Inter-ganglionic spaces. 



i.Lrn. Gill muscle. 



i.n.l Inner neurilemma; neuroglia. 



int Intestinal nerve. 



i^og .Post-oral or mesocephalic neuromeres. 



i.o.l . Infra-orbital line of canal organs. 



i.p. . Internal pores. 



i.pl Intestinal plexus. 



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



i.sh . . Inner neurilemma sheath. 



i-V. . .Infoldings leading to neural canal. 



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



iv.ol.l Invagination for olfactory lobes. 



