TWENTY MONTHS OF STARVATION IN AMIA CALVA. 461 



movement associated with the passage of water over the gills is 

 correlated with the drawing in of the water into the mouth so 

 that not only the vagus group of nerves but the trigeminal 

 complex also is involved in this apparently simple reflex. 1 In 

 attempting to determine what group of cells was constantly at 

 work in this respiratory movement, one is unable to be certain 

 which group is doing the work. There does not seem to be any 



FIG. 3. Microphotograph of amitotically dividing muscle nucleus. The 

 smaller black bodies are muscle nuclei undergoing degeneration. The red blood 

 corpuscles serve as a measure of the amount of change that some of them have 

 undergone. 



way of determining which group of cells in the reflex chain is 

 expending the greater amount of energy; is it the group of cells 

 that receives the initiating stimulus or the one that sends the 

 motor stimulus to the muscles of the gills and operculum? 

 Several of the nerve centers associated with the trigeminal and 

 vagus were studied in an attempt to determine the influence of 



1 Allis, E. P., 1897, "The Cranial Muscles and Cranial and First Spinal Nerves 

 in Amia caha," Jour. Morph., Vol. XII., no. 3.. Herrick, C. Judson, 1899, " Cranial 

 and First Spinal Nerves of Menidia, a Contribution upon the Nerve Components 

 of the Bony Fishes," Jour. Near., Vol. IX. 



