DISTRIBUTION OF SUBCUTANEOUS VESSELS IN GANOIDS I57 



L.I.J. V. Left fork of the inferior jugular vein. 



L.L. T. Lateral lymphatic trunk. 



Z.A^.(i). Lymphatic network on surface of the thymus gland and 

 adiacent region, Polyodon. 



L.N. {2). Lymphatic network overlying the facialis blood vessels, 

 Polyodon. 



L.N. {2,). Lymphatic network in hyo-opercularis region of Polyodon. 



L. V.L. T. Left fork of the ventral lymphatic trunk. 



M. Dorsal sinus emptying into the inferior jugular, Polyodon. 



Man. Mandible. 



Med. Tunica media. 



M.O. Orifice of the dorsal sinus opening into the inferior jugu- 

 lar, Polyodon. 



My. Myelon. 



Myo. Myotomes. 



N. Posterior sacs of Polyodon that terminate in the inferior 

 jugular. 



N.Br. A. Nutrient branchial arteries. 



N.Fil.A. Nutrient filament arteries. 



N.M. Nucleus smooth muscle. 



N.S. Nasal sac. 



o. In Fig. 15 orifice of pericardial sinus leading into the 

 dorsal pericardial sinus. 



Oc.S. Occipital sinus, Lepisosteus. 



Oc.S.O. Occipital sinus opening into the pericardial sinus. 



CEs. CEsophagus. 



O.L. Optic lobes. 



O.Per.S. Parietal or outer layer of the pericardium. 



Op.M. M. Opercularis. 



O. F.Af. (i)-(4). Obliqui ventrales muscles 1 to 4. 



P. Papilla. 



Pec.A. Pectoral arch. 



Per.C. Pericardial cavity. 



Per.L. T. Pericardial lymphatic trunk, Polyodon. 



Per.S. Pericardial sinus, Lepisosteus. 



Per.S.(i). Anterior continuation of the pericardial sinus. 



Per.S. O. Communications of the pericardial sinuses with the 

 dorsal pericardial sinus. 



P.P. Pectoral fin. 



P.P.Add. Pectoral profundus adductor muscle. 



Prec. Precava. 



Prem. Premaxilla. 



P. S. Pectoral sinus. 



P.S.O. Pectoral sinus emptying into the occipital sinus. 



Pt. Post-temporal. 



R.C. Red corpuscle. 



Res.N. Respiratory network. 



R.Hyom. Retractor hyo-mandibularis muscle. 



R.I.J. V. Right fork of the inferior jugular vein. 



R.I.J.V.O. Right fork of the inferior jugular opening into the in- 

 ferior jugular. 



