258 Transactions of the Royal Society of South Africa, 
8. The homology of the postcaval and posterior cardinals is dis- 
cussed ; the hepatic portal is joined to the postcaval at the point where 
the latter leaves the mesonephros. There are no cuvierian ducts. 
9. The filtering apparatus is copiously supplied with blood from all 
the aortic arches except the systemic, and is probably the most important 
respiratory organ. 
10. All the cranial nerves were found, but the 4th, 5th, 6th, and 7th 
were all united proximally to a single ganglion, which was joined (?) to the 
diencephalon in front of the optic lobes. The 9tli and 10th were also 
joined in a single ganglion, perhaps attached to the ventricle. 
