48 SOLENODON PARADOXUS. 



Lungs. — The lungs (Plate 9, fig. 1) of Solenodon paradoxus are capacious 

 and the jileural cavity extends l^ack as far as tlie loth ril). .^t tliis point tlic 

 diaphragm arises from the l)ody wall and passes obli(|uely forward on each side, 

 along the ventral edges of the sternal ribs to the l^ase of the xiphisternum. The 

 lobes of the left lung seem a trifle smaller than those of the right. The left 

 lung is divided into three simple lobes of which the anteriormost is the least, 

 the posteriormost the greatest. The right lung lias in atldition to the three 

 main divisions corresponding to those of the other side, a well developed azygos 

 lobe arising from the base of the large third lolie. The second lobe differs from 

 that of the left side in having a transverse fissure by which it is divided into an 

 anterior and a posterior ]Jortion. Peters figures no azygos lobe in the lungs of 

 (S. cuhanus, and tlie left middle lol^e seems to be more elongated transversely. 

 Ajjparently tS'. paradoxus resembles Centetes in the character of the lung. Erina- 

 ceus is remarkable in having a simple, undivided left lung and greatly elongated 

 azygos lobe. In Gymnura and Chrysochloris the left lung is divided into two 

 lobes and the azygos lobe is more like that of S. paradoxus, in which a further 

 step has been taken by the development of a third lobe at the anterior end of 

 the left lung. The lungs of Potamogale are described as es&entially similar to 

 those of Centetes. 



Heart and its vessels. — The ventricles of the heart (Plate 9, fig. 2) form a 

 rounded mass about 25 nun. long. The right auricle is noticeably larger tJuvn 

 the left, with thicker walls. The aorta arises as a large trunk from the right side 

 of the heart, and at the point where it curves to the left side, sends off a large 

 branch. This after about 5 mm. divides into two large arteries, the more exterior 

 of which is the right subclavian, the more interior the right carotid. The left 

 carotid arises separately from the main trunk of the aorta close beyond the first 

 large branch. The left subclavian likewise is given off independently just 

 posterior to the last. The aorta then passes ]iosterit)rly and is joined on the 

 ental side by the ductus arteriosus. The pulmonary arteries as usual come 

 from the conus arteriosus. The arrangement of the vessels is thus practically 

 the same as in Centetes, Potamogale, Chrysochloris, and Myogale. 



Excretory and genital organs. — The kidneys are similar in both sexes. 

 They are large oval bodies in the usual position against the l^ody wall of the 

 lumbar region, that of the right side slightly anterior to that of the left. The 

 ureters are slender tubes leading as usual to tln' bladder on each side. The 

 atlrenal liodies are oval, each about one thirtl the length of the kidney, and 

 closely appressed along its antero-median liorder from the hilum nearly to the 

 anterior end (Plate 9, fig. 9). 



