NILS ROSÉN, STUDIES ON THE PLECTOGNATHS. 23 



*19. Meckel: System d. vergl. Anatomie. V. 



*20. Milne-Edwards : Legons de Phys. et d' Anatomie comparée. 



Tome 3°^«- 

 21. MtJLLER, J. : Gefässystem der Myxinoiden. — Abhandl. K. 



Akad. d. Wiss. Berlin 1839. 

 ''22. Parkee, g. H. : Xote on the Blood Yessels of the Heart in tlio 



Sunfish. — Anat. Anz. Bd. 17. 



23. Parker, G. H., & Davis: The Blood Vessels of the Heart in 



Carcharias, Raja and Amia. — Proc. Brston Soc. N. H. 

 Vol. 29 (1899). 



24. Parker, T. J.: Zootomy. 



*25. Plancus: Comm. bonon. t II, p. 297 (1755). — (After Cuvier). 

 26. Rand & Ulrich: Posterior connections of the lateral vein of 



the Skate. — American Naturalist. Vol. 39 (1905). 

 *27. PtiDEWOOD: On the realtions of the Efferent Branchial Blood- 



vessels to the circulus cephalicus in Teleostean Fishes. — 



Proc. Zool. Society, London 1899. 

 *28. Stannius: Handbuch d. Zootomie. 

 *29. Steenstrup & LIjtken: Bidrag til Kundskab om Klump- eller 



Maanefiskene (Molidae). Mém. de TAcad. R. d. Sciences et 



d. Lettres de Danemark. Copenhague. 6 Sér. t. IX. (1898). 

 *30. Wahlgren: Några anteckningar om en stor Klumpfisk, Mola 



nasus. Lunds Universitets Årsskrift. Tom IV (1868). 

 *31. Wellenbergh: Observationes anatomicae de Orthagorisco IMola. 



Lugduni Batavorum. 1840. 

 32. VoGT und Yung: Prakt, vergl. Anatomie. 



Explanation of Plates 

 Plate I. 



Venous system of Spheroldes testudweus L. (ventral view). 



«; atrium. 



d. C. s., ductus Cuvieri sin. 



go, gonad. 



I, liver. 



r. s., left kidney. 



v, ventricle. 



v. caud., vena caudalis (the broken lines indicate the loop in the 



haemal canal). 

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

 v. c. p. s., vena cardinalis posterior sinistra. 

 v. g., genital vein. 

 v. hep. vena hepatica. 

 v. jug. inf., vena jugularis inferior. 

 v. jug. sup. s?w.,vena jugularis superior sinistra (v. card. ant. sin.). 



