150 ALLEN 



R.ImI.X. Ramus lateralis vagi. 



5'. A sinus in Polyodoii, which lies above the ventral aorta 



and opens into the inferior jugular above. 

 S.Cl. Supra-clavicle. 



S.AI.F. Smooth muscle fiber. 



S.P.Abd. Superficial pectoral abductor muscle. 



Spt'r. Spiracle. 



S.T. Communicating trunk from sinus 5" to inferior jugular. 



Ster.T. Sterno-hvoideus tendon. 



Stcr. V. Sterno-hjoideus vein. 



Sub. A. Subclavian artery. 



S. Veii. Sinus venosus. 



5. Ven.O. Orifice of sinus venosus leading into the auricle. 



Tr.F.L,.V. Transverse filament lymphatic vessels (nutrient veins?). 



V. Point where cephalic sinus joins jugular vein. 



V.A. Ventral artery. 



V.Ao. Ventral aorta. 



V.Br.L.T.[i)-[j^). Ventral branchial lymphatic trunks (nutrient veins?) I to 



4, LepisostcHS. 



V.Br.L. T.{i )-(4)(9. Ventral branchial trunks opening into the inferior jugular. 



Vefi. Ventricle. 



V.L.T. Ventral hmphatic trunk. 



V.L.T.O. Ventral lymphatic trunk opening into the pericardial 



sinus. 



V.V. Ventral vein. 



V. Vas. Vasa vasorum. 



W. C. White corpuscle or leucocyte. 



X. Combined trunk formed by the union of the third and 



fourth dorsal branchial trunks with the dorsal fork'of 



the second branchial trunk. 



z. Point of union of the third branchia trunk with the 



fourth. 



/. Olfactory nerve. 



//. Optic nerve. 



F.(2). Truncus buccalis maxillo-mandibularis. 



V and VII. Trigemino-facial complex. 



VIII. Auditory nerve. 



IX. Glossopharyngeal nerve. 



X. Vagus nerve. 



