. Bulletin . ctus Botalli waren offenbar friiher weite Aortenbogenvon dem truncus arteriosus des Herzens zu den Carotiden undvon diesen weiter zur Aorta. (loc. cit., pp. 191.) I have already described the same structures found inBdellostoma dombeyi. In addition to the observation ofMiiller, I have added that a spheroidal or flattened mass ofconnective tissue is found attached to the ductus a shortdistance from its origin. This body is larger and moresaccular in appearance in Bdellostoma forsteri. (See textfigure E, z), and evidently may be interpreted as the rudimentof the i^ill pouch correspo
. Bulletin . ctus Botalli waren offenbar friiher weite Aortenbogenvon dem truncus arteriosus des Herzens zu den Carotiden undvon diesen weiter zur Aorta. (loc. cit., pp. 191.) I have already described the same structures found inBdellostoma dombeyi. In addition to the observation ofMiiller, I have added that a spheroidal or flattened mass ofconnective tissue is found attached to the ductus a shortdistance from its origin. This body is larger and moresaccular in appearance in Bdellostoma forsteri. (See textfigure E, z), and evidently may be interpreted as the rudimentof the i^ill pouch corresponding to the obliterated branchialartery. A similar ductus Botalli from the first branchial 25 38 C. M. Jackson. artery is found in certain Caducibrancbiata. in these cases, arete niirabile persists in the course of the ductus, and rep-resents the obliterated gill. (Balfour, Comp. Embryol. Vol II.)Since the ductus Botalli is a constant feature in allspecimens of Bdellosto^na examined, its significance lies in.
Size: 887px × 2819px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishercincinnati, bookyea
