THE EMBRYOLOGY OF THE OPOSSUM 



15 



ABBREVIATIONS USED IN ALL FIGURES 



a., atrium of heart 



a.c., anterior semicircular canal 



a.c.a., anterior cerebral artery 



a.c.v., anterior cardinal vein 



a.f., axial filament 



a.g., anal musk gland 



a.g.o., anal gland orifice 



alb., albumen 



all., allantois 



a.l.r., anterior limb ridge 



am.c., amniotic cavity 



amp., ampulla 



an., anus 



ao., aorta 



a.r., anterior ridge of otocyst 



at., atrium of otocyst 



b., bladder 



b.a., branchial arch 



b.p., branchial pouch 



b.r., branchial ridge 



c., coelom 



c.a., conus arteriosus 



can.r., canalis reuniens 



c.c., crus commune 



ce., centriole 



cho., chondriosome 



chr., chromosome 



i-l., glans clitoridis 



co., cochlea 



c.o., cumulus oophorus 



c.r., centriolar ring 



p.t., caudal tube 



c.u., cervix uteri 



d.a., dorsal aorta 



d.m., dorsal mesocardium 



d.m.l., dorsal mesocardial line 



e.d., endolymphatic duct 



end., endoderm 



e.s., endolymphatic sac 



ex., excrescence from distal centriole 



F., fallopian tube 



f.g., fat globule 



f.l.. follicular liquid 



fo., foregut 



g., ganglion 



h., hypophysis 



H.n., Hensen's node 



i., infundibulum 



id., idiozome 



j., jugular vein 



k., metanephros 



!.!>., lung bud 



I.e., lateral semicircular canal 



l.c.v., lateral cephalic vein 



l.g., lateral groove of pharynx 



l.p., lung pouch 



l.r., lateral ridge of otocyst 



l.v.i-.. lateral vaginal canal 



m., mesonephros . 



m.c.v., middle cephalic vein 



M.d., mullerian duct 



met., metencephalon 



m.g., medullary groove 



m.p., medullary plate 



ni.t ., mesonephric tubule 



m.v.c., median vaginal cul-de-sac 



n., notochord 



n.c., neural crest eclls 



n.p., notochordal plate 



mi., nucleus 



n.v.ch., non-vascular chorion 



o., ovum 



o.a., ophthalmic artery 



o.p., otic placode 



op.c., optic cup 



op.l., optic lobe 



ot., otocyst 



ot.c., otic cup 



ot.p., otic placode 



ov., ovary 



o.v., omphalomesenteric vein 



1 1., perineum 



p.b., polar body 



p.b.c., posterior branchial complex 



p.c., posterior semicircular canal 



p.g., primitive groove 



ph. I'., pharyngeal bursa 



1 ill. in., pharyngoal membrane 



pi., placenta 



p.m., parietal mesoderm 



