FIG. 316 



AU 



318 



322 



320 



VEN 



VEN 



Figs. 316-325. Heart and arterial cone of fishes. 316. Heart of shark; 317, Heart 

 of catfish, Silurus glanis ; 318, Heart of shark, shown opened at the side. 319. Conus 

 arteriosus (inner view) of Chimcera, 320. Conus of Ceratodus. 321. Conus of Protopte- 

 rus. 322. Conus of Lepidosteus. 323. Conus of Amia. 324. Conus and bulbus of the 

 Teleost, Butrinus, 325. Conus and bulbus of the Teleost, Clupea. (Figs. 316-318 

 after WIEDERSHEIM, 320-325 after BOAS.) 



A. Aorta. AU. Auricle. B. Bulbus. C. Conus. V. Valves. VEN. Ventricle. 



258 



