ANATOMICAL SOCIETY OF GREAT BRITAIN AND IRELAND, xvii 



unites the two organs (/, fig. 2 ; //, fig. 1). Superiorly this vestigial 

 structiire became blended with the wall of the right auricle close to 

 the posterior extremity of the right auriculo-ventricular groove, but 

 no trace of an orifice was revealed on laying open the auricle. In- 

 feriorly this fibrous remnant, which, so far as I could make out, lay 

 free within the pericardium, was attached to the tendinous part of the 

 diaphragm (see h, fig. 1), and also to the accessory organ near its 

 orifice or attached end. The so-called accessory heart, which was 

 about the size of the human ovary, was covered with an epicardiac 

 layer. To the feel its diaphragmatic surface was thicker and more 



Fig. 1.— «, trachea ; h, aorta ; c, left anterior cava ; d, puhnonary artery ; c, left 

 pulmonary artery ; /, left pulmonary veins ; g, post vena cava ; h, vestigial 

 remains of left omplialo-meseraic vein ; i, sinns-like dilatation ; j, opening 

 from sinus into post vena cava; 1% post vena cava ; I, anomalous organ (liver) ; 

 m, left ventricle ; n, left auricle ; o, right ventricle. 



fleshy than that aspect which was directed towards the other heart, 

 where the muscular wall seemed distinctly thinner. This difference in 

 the thickness of its wall led to the supposition that it was subdivided 

 into an auricular and ventricular part— a supposition, however, which 

 was not confirmed by subsequent observation. The external aspect 

 of the organ also presented appearances which seemed to indicate that 

 it was separated into two cavities (see fig. 2, h). 



In regard to the connections of this anomalous organ, the conditions 

 are somewhat obscure, owing to the mutilation of the diaphragm and 



