OCR Text |
Show 1890.] ANATOMY OF THE CONDOR. 143 With regard to the trabecular of the Crocodile's right ventricle, is stated that " these have in Birds for the most part disappeared, with the exception of a broad trabecula which runs from the margin of the valve to the anterior ventricular wall." This is compared to the fleshy bridge already spoken of in the Crocodile heart. It is, of course, difficult to follow so detailed a description as that which Gegenbaur gives without illustrations ; I may therefore be wrong in Fig. 1. Eight ventricle of Crocodile opened to show auriculo-ventricular valve. The fibrous parts are dotted ; the muscular indicated by lines. A, attachment of valve to parietes by a specially strong muscular band ; B, muscular tissue in septal half of valve. identifying the structure lettered A in the accompanying drawing (woodcut, fig. 1) with the fleshy bridge which unites in the Crocodile the valve with the ventricular wall, as described by Gegenbaur. Its position and relations seem to me, however, to point to its identity with the fleshy bridge in the Bird's heart (cf. figs. 1 & 2, A). It will be noticed that in the Crocodile this bridge of muscle marks 11* |