96 Caroline McGill, Fibroglia Fibrils in the Intestinal Wall of Necturus etc. 



through granular protoplasm. The cells may be stellate with ovalil 

 nuclei or much elongated with rod-shaped nuclei. In every case the 

 protoplasm is a syncytium there being abundant anastomoses between 

 the cells. 



3. Where the cells are stellate the fibrils run in all directions 

 forming a network. Around the elongated cells the fibrils are arranged 

 parallel with the long axis of the cell just as in the case of smooth 

 muscle. 



4. The fibrils may be either coarse or fine. The coarse fibrils 

 closely resemble coarse myofibrils, the fine, the fine myofibrils. 



5. With all stains used the fibroglia fibrils stain just as do the 

 myofibrils. 



6. There is some evidence that the fibroglia fibrils are contractile. 



7. In general arrangement, as well as in many details of struc- 

 ture, the fibroglia fibrils, with the cells containing them, resemble smooth 

 muscle in certain stages of its development. 



8. Throughout, the similarity of the fibroglia fibrils to myofibrils 

 is very apparent. This resemblance is so close that it seems unneces- 

 sary to give them a separate name. They should be considered merely 

 as a type of myofibril. 



Columbia, Missouri, June 1, 1907. 



