A treatise on zoology . Fig. Ventral \iew of the heart conns, and the disposition of the aoitic arches, ai--*, fouraortic arches, a dotted line passes up the base of the 1stand combined 3rd and 4th ; nt, atrium ; c, cut wall ofconus ; /, plug tilling the atrio-ventricular opening; Iv,small posterior valves ; p, portion of wall of pericardium ;.-••.(?, specialised row of enlarged valves; t, truncus; r,anterior valve, also cut wall of ventricle ; w and z, dottedlines passing into the sinus venosus. (Compare Fig. 218,p. 249.) VA SCULA R S YS TEM ?,\ together of the cpibraiichial ve
A treatise on zoology . Fig. Ventral \iew of the heart conns, and the disposition of the aoitic arches, ai--*, fouraortic arches, a dotted line passes up the base of the 1stand combined 3rd and 4th ; nt, atrium ; c, cut wall ofconus ; /, plug tilling the atrio-ventricular opening; Iv,small posterior valves ; p, portion of wall of pericardium ;.-••.(?, specialised row of enlarged valves; t, truncus; r,anterior valve, also cut wall of ventricle ; w and z, dottedlines passing into the sinus venosus. (Compare Fig. 218,p. 249.) VA SCULA R S YS TEM ?,\ together of the cpibraiichial vessels to form the dorsal aorta, the. Braiicliial cireulalioii of VtmtoiXv^ (from Spencers figures). I-V, live braneliial slits ; ahr,anterior t>tferei)t vessel; , anterior carotiil ; 0/^-6, four afferent vessels (corresponding tothe original arclies-*); c, conns ; el, coeliac artery ; rf, dnetns Cuvieri; cf)•-», second and fourthepibrancliial arteries; , hyoid artery (from original 2nd arch); //, air-bladder; , lingualartery; ,ais, mesentrie artery; ;).f(, pulmonary artery; phr, posterior efferent vessel; ,posterior cardiuiil ; j). r, pulmonary vein; s, ])osition of closed spiracle ; , ventral artery;, vena (tTSmferior. The gills are re])r(sented on the hyoid ancl next 4 branchial arches.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
