154 
Opt.A. 
Opt.L. 
Opt.V. 
Op.V. 
Orb.A. 
Ov. 
O.V.M. 
P.A. 
P.A.BI.A. 
P.A.BI.V. 
Paras. 
P.Aud.A. 
P.Aud.V. 
P2G.E.M. 
P.Cer.A. 
P.Cer.V. 
124 Gal fsa 
P.E.Br.A. 
Pec.F. 
Pel. 
Pel.P. 
Pence 
P.Gas.A. 
P.Gas.V. 
P.G.BI.A. 
Gap lave 
Phar.A. 
Ph.H.M. 
P.Hyo.A. 
Pig.L. 
P.Mes.A. 
P.Mes.V. 
P.P.Ad.M. 
Prec.V. 
Pref. 
Prem. 
Preo. 
Pro. 
Ps. A. 
P.S.Ad.M. 
Pseu. 
Ps. Fil.Net. 
Py. 
Pyl.A. 
Ryle 
R.Cz.A. 
REC Vi. 
RAGarovi 
R.Cau.A. 
ALLEN 
Optic or retina artery. 
Optic lobes. 
Optic or retina vein. 
Opercular vein. 
Orbital artery. 
Ovaries. 
In Hydrolagus. 
Obliqui ventrales muscles. 
Posterior ampulla. 
Posterior air-bladder artery. 
Posterior air-bladder vein. 
Parasphenoid. 
Posterior auditory artery. 
Posterior auditory vein. 
Pharyngo-clavicularis externus muscle. 
Posterior cerebral artery. 
Posterior cerebral vein. 
Pharyngo-clavicularis internus muscle. 
Posterior efferent branchial arteries. 
Pectoral fin. 
Pelvic arch. 
Ventral process of the pelvic arch. 
Posterior encephalic vein. 
Posterior gastric artery. 
Posterior gastric vein. 
Posterior gall-bladder artery. 
Posterior gall-bladder vein. 
Pharynx artery. 
Pharyngo-hyoideus muscle. 
Posterior hyoidean artery. 
Pigment layer of the choroid coat. 
Posterior mesenteric artery. 
Posterior mesenteric vein. 
Pectoral profundus adductor muscle. 
Precaval vein or Ductus Cuvieri. 
Prefrontal. 
Premaxilla. 
Preopercular. 
Prootic process. 
Pseudobranchial artery. 
Pectoral superficialis adductor muscle. 
Pseudobranchia. 
In Aydrolagus. 
Pseudobranchial filament capillary network. 
Pylorus. 
Pyloric artery. 
Pyloric vein. 
Right pyloric ceca artery. 
Right pyloric ceca vein. 
Right cardinal vein. 
Right caudal artery. 
