CIRCULATORY SYSTEM OF ELASMOBRANCHS. 453 
inwards almost horizontally on the ventro-lateral sides of the 
cesophagus through a very conspicuous notch in the posterior 
border of the fifth cerato-branchial cartilage up to the lateral 
wall of the pericardium. It is continuous through this with the 
sinus venosus. 
Text-figure 4. 
acer enn Ned &, 
Co. 
Lateral view of the heart to show the arrangement of the coronary veins. 
For explanation of lettering see p. 454. 
1X. List or REFERENCES. 
1. Banrour, F. M.—‘“‘ The Development of Elasmobranch 
Fishes.” Journ. Anat. & Physiol., 1876-1878. 
2. Diamare, V.—“ Sw’ rapporti della vena porta e delle arterie 
splaneniche in Seylliwm catulus e Torpedo marmorata.” 
Anat. Anzeig. Bd. xxxiv., 1909. 
2a. GRossER, O.— Die Elemente des Kopfvenensystems der 
Wirbeltiere.”- Verh. Anat. Ges. Wiirzburg, 1907, Anat. 
Anz. Erganzungsh. zu Bd. xxx. 
3. Hocusterrer, F.—‘‘ Vergleichenden Anatomie und Entwick- 
lung des Venensystems.” Morph. Jahrb. Bd. xiii., 1888. 
4. Hocusterrer, F.—‘‘ Die Entwicklung des Blutgefisssystems.” 
In Hertwig’s Handbuch der Entwicklungslehre der 
Wirbeltiere, 1901—06. 
5. Horrmann, O. K.—“‘ Zur Entwickelungsgeschichte des Venen- 
systems bei den Selachiern.” Morph. Jahrb. Bd. xx., 
1893. 
6. Kinestry.—Guides for Vertebrate Dissection. New York, 
Ore 
7. O'DonocHuE, C. H.—‘‘ The Circulatory System of the 
Common Grass-Snake.”+ Proc. Zool. Soc. 1912. 
8. O’'Donoeuur, C. H.—‘‘ Two Cases of Abnormal Heart and 
One of an Abnormal Anterior Abdominal Vein in the 
Frog.” Zoolog. Anzeig. Bd. xxxvii., 1911. 
30* 
