24 ARKIV FÖR ZOOLOGI. BAND 7. NIO 25. 



V. lat. d.^ vena lateralis dextra. 



v. lat. s., » » sinistra. 



v. p., vena portae. 



v. suhcl. d. (s.), vena subclavia dextra (sinistra). 



7, 2^ veins from tlie bodywall. emptying in tlic renal capillary 



system. 

 .?, vein from the integument, emptying in the renal capillary 



system. 



4, vein from the lateral body muscles, emptying in the renal 



capillary system. 



5, ^, 7, 8 — 10, veins from the alimentary canal. 

 9j vein from the air-bladder. 



11 — 13, veins from muscles. 

 14., vein from the lateral body muscles. 

 15^ vein from the under side of the tail. 

 16., vein from the pectoral muscles. 



Plate II. 



Spheroides festudineus L. Figure showing the course of the left 

 lateral vein (y. lat. sm.) and the abdominal part of the ven- 

 tral artery (red). Ventral view. The viscera of the left side 

 are thrown över to the right side. Compare ^vith Plate I. 



v. c. p., vena cardinalis posterior (unpaired portion). 



v, lat. sin., vena lateralis sinistra. 



v. p.^ vena portae (posterior connection vvith the anastomose be- 

 tween the right lateral vein and vena cardinalis posterior). 



1, stomach. 



2, air-sac. 



3, left kidney (thrown över). 



4, intestine. 



5, opening of oesophagus in stomach. 



6, edge between stomach and air-sac. 



7, wall of the air-sac (cut off). 



8, pylorus. 



9, anastomose between v. card. post. and left lateral vein. 



10, anterior left head of ventral longitudinal muscles, attaching at 



the ligament between the ventral ends of clavicules. 



11, caudal fin. 



12, anal tiu. 



Tryckt den 6 februari 1912. 



Uppsala 1912. Almqvist Är Wiksells Boktryckeri-A.-B. 



