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VI. EXPLANATION OF PLATES: 
All figures are from Preparations of Necturus, except where otherwise 
stated. All, with the exception of Figures 22 and 46, were drawn with the 
aid of the camera lucida. 
The magnifications are indicated in the descriptions of each plate, and 
the means of obtaining them are shown in the following table: 
OBJECTIVE | MAKER OcuLarR MAKER oe Macnirication 
ENGTH IN DIAMETERS 
E Zeiss No. 3 Zeiss 136 mm. 830 
E Zeiss Sheth clemA Zeiss 130m goo 
13 Zeiss sn Zeiss Igo. * 1300 
a Zeiss Tate Zeiss E36: a | 3800 
Tz Leitz See a Zeiss 1365s ee 1450 
. Leitz Ny Zeiss 1305 uN 1000 
Soe ne Wetez Bes Zeiss TaiG, 1450 
“| Leitz ars: Zeiss ce 1850 
eS |  Fuess pee Fuess 1000 
No. 9 Fuess oan Fuess 450 
No. 5 Fuess ee Fuess | 300 
