. The Batrachia of North America [microform]. Amphibians; Amphibiens. :i :i yi '«. 23') lU' :tl, UNITED STATES NATIONAL Ml'SElM. the form of tlio cnrlilagos of tlio larjiix. Tlie size iiiid niiiiilHT of (lie pulmonary cells vuiy coiisidoraltly. Amoiif; Ilylida', tiioso speck's with a loiiil voicf, tlicy are fewer and larger than in die and Scaphiopida'. The forms of the sinus, auricles, venlricile, and bulbus arteriosus, the throe aorta bows, of which the median foruj the aorta roots, etc., appear (piite identical externally in the Discoglossus, Scapliioi)us,
. The Batrachia of North America [microform]. Amphibians; Amphibiens. :i :i yi '«. 23') lU' :tl, UNITED STATES NATIONAL Ml'SElM. the form of tlio cnrlilagos of tlio larjiix. Tlie size iiiid niiiiilHT of (lie pulmonary cells vuiy coiisidoraltly. Amoiif; Ilylida', tiioso speck's with a loiiil voicf, tlicy are fewer and larger than in die and Scaphiopida'. The forms of the sinus, auricles, venlricile, and bulbus arteriosus, the throe aorta bows, of which the median foruj the aorta roots, etc., appear (piite identical externally in the Discoglossus, Scapliioi)us, and rhyllomediisa. Internally the two former present the known characters of the Annra, /. e., the union of the distinct ducts of the first (i)nlmonary) and second (aortic) aorta bows thro'ighont much of their length, the separate union of the two former and (tontinuance on the left side of a high free septum of tlu» bulbus, till they are finally turned over the riglit division toward the right, and have a common issue from the ventricle. A conic pocket valve is at the origin of the bifurcation of the ductus communis of tlie second and third aorta bows, but none in any part of the course of the pulmonary. The general characters of the venous system have iteen (b'scribed on page 10. The researches of Ifochstetter * and HowesI Inive shown that the cardinal veins do not disapi)ear in all of the Salientia. Ilochstet- ter in fact believes "that the vena cava inferior, instead of being throughout its whole extent a i>rimarily independent vessel, is a com- pound structure, the product of a fusion between a late-formed hepatic vessel and one or both of the posterior cardinal veins" (Howes). In IJatrachia the postrenal portions only of the (iardinals go to form the vena cava i)osterior, and the prerenal p(»rtions disappear or remain I's azygos or hemiazygos veins. Their persistence is shown to hi' fre quent in theDiscoglossida', in l>ombinator (llochstetter Howes), A
Size: 930px × 2688px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpubli, booksubjectamphibians
