226 



Nachdruck verboten. 

 Studies on Nerre Cells. 

 ni. Some metabolic Bodies in the Cytoplasm of Nerre Cells 

 of Grasteropods, a Cephalopod, and an Annelid ^). 



By W. M. Smallwood and C. G. Rogers. 

 Withi 3 Figures. 



We purpose in this paper to report such of our observations on 

 nerve cells as have not been included in the two previous "Studies" -). 



Bermuda Mollusca. 



Chromodoris zebra. In the contributions of several investiga- 

 tors, the opisthobranchs have furnished striking conformation of the views 

 of Holmgren in reference to the nature of the Saftkanälchen. The 

 senior writer has for some time desired to examine the living nerve 

 cells of opisthobranchs, and accordingly took advantage of his first 

 opportunity to do so, which occurred during January, 1909, when he 

 visited the Bermuda Biological Station. The time at his command 

 was so limited that no feeding, fatigue, or starving experiments were 

 possible, 



Chromodoris zebra is a beautiful and relatively large nudibranch, 

 which seems to be sexually active throughout the year at Bermuda, 

 as its eggs are to be found at any time during the twelve months. 

 This would seem to indicate that the conditions found in January are 

 quite typical ; at any rate, the individuals studied were depositing eggs 

 at that time. 



The nerve cells in this nudibranch are the largest that we have 

 found in any of the animals studied. They are easily dissected out 

 and give a very definite reaction to tests for fat. No difficulty was 

 experienced in observing these nerve cells under the Ve-inch objective, 

 and in some instances the -/s-ioch objective was adequate. The cytoplasm 

 was packed full of brownish bodies, which were almost entirely confined 



1) Contributions from the Bermuda Biological Station for Research, 

 No. 19, and Contribution from the Zoological Laboratory of Syracuse 

 University. 



2) For Studies etc. I. see Journ. Comp. Neurol, and Psychol, Vol. 18, 

 p. 75 — 85, 1908. For Studies etc. II. see Folia neuro-biologica, Bd. 3, 

 p. 11—20, 1909. 



