Johnson—Pyloric Caeca of the C entrarchidae. 721 
4. The branching of the caeca, which is normal in Microp- 
terus salmoides, was investigated quantitatively. Cases 
of fused or branching caeca were found in the other 
five species, although normally their caeca are un¬ 
branched. 
Anatomical Laboratory, University of Wisconsin. 
