32 



Einar Lönnberg, 



mm. When a comparison is made with the following stage it is evi- 

 dent that these two organs are not vet fully developed. 



The posterior ends of the rings of the trachea are united in 

 such a way as to form a sharp edge which is directed towards the 

 right side and backwards. The left lung is divided into three lobes, 

 the right in five or nearly six and an azygous or intermediate lobe. 

 The lungs are thus much divided. The lobus apicalis of the right lung 

 is divided into an anterior and a posterior lobe and each of these has 

 in its anterior margin a slit which in the anterior lobe extends through 

 more than three fourths of the lobe. The lobus cardiacus of the right 

 lung is perfectly divided into a dorsal and a ventral lobe. 



The liver has a short umbilical fissure. The right lobe is a 

 little larger than the left. The caudate lobe is long, trihedral and 

 reaches the margin of the right main lobe. It caps the kidney. The 

 Spigelian lobe is only little developed. There is, of course, no trace 

 of a gall-bladder. 



The ventricle and the intestine resemble in their relative size 

 and arrangement so closely the same of the following stage g. so that 

 it seems unnecessary to repeat the description of these organs twice. 



The penis has a very characteristic structure as may be seen 

 from the figure (fig. 21). The urethra runs as usual along the lower 

 side of the organ, but at some distance (about 5 mm.) from the tip 

 of the glans it makes a sharp transverse twist towards the left, ascends 

 somewhat on the left side, then bends sharply forwards and runs as 

 a free filiform and tapering prolongation first in a groove on the left 

 side of the glans, at the end nearly reaching the median line; then it 

 continues a good deal (about 8 mm.) beyond the apex of the glans. 

 The real glans is formed by a rather large cushion or swelling which 

 thanks to the general twisting of the whole organ has been turned 

 over towards the right side. It forms also the whole of the apical 

 end of the penis and its relation to the urethral prolongation has al- 

 ready been mentioned and may be seen from the figure. In Cepha- 

 lophus maxwelli Garrod has described 1 ) a similar shape of the penis 

 (termed »ovine» by him) but he says that »it is more symmetrical*. 

 I am inclined to think that this alleged symmetry is due to a less good 

 condition of his material. The shape of this organ of Cephalophus 

 melanorhoeus is most similar to that which I have described above 



*) Proc. Zool. Soc. London 1877. 



