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Ubersetzungsrecht vorbehalten. 
The central nervous system of Tunica nigra.') 
By 
William A. Hilton. 
With 11 figures in the text. 
Contents. 
Page 
bnodpetion US à os à ON ne 
Seneraälsformrofthe ganglion, . . +. : 0 UE 
Fheuscreeture, of the ganglion . . ‘./. Vai HONOR IE 
[he relation of cells to each other . . . "HO RS 
Simseinreofsthe: cells Sr = es «aid Vo ee OR ee 
Senne re i Ee co, 
Introduetion. 
While enjoying the advantages offered by the Bermuda Marine 
Biological Station, through the kindness of Prof. E. L. Mark, the 
director, I was able to obtain a large number of specimens of Tunica 
nigra. This form is very abundant on Agar’s Island and out on the 
nearer reefs. Specimens were studied by several methods; some 
were examined in the fresh condition, while the ganglia of others 
were dissected out and fixed in various ways for sectioning. CARrNoY’s 
fluids were largely used for fixation, and were followed by staining 
1) Contributions from the Bermuda Biological Station for Research, 
No. 29. 
Zool. Jahrb. XXXVII. Abt. f. Anat. 8 
