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EXPLANATION OF PLATES XIX-XXVIII. 
The figures were drawn with the aid of an Abbé camera lucida, under Zeiss 
apochromatic obj. 1.5™" N. A. 1.30, combined with compensating ocular 18; 
except figs. 13, 14, 133, 134 drawn with compensating ocular 12; jigs. 193, 
109, 114-118, 124, 126, 132, 135, 163-171 drawn with ocular 4; and jigs. O50 
744, 1474,-153a, 1710’ drawn with compensating ocular 18 under higher ma 
cation obtained when the tube was extended to the furthest point. The plates 
are reduced one-half the original size, except plates XXI, XXII and XXVIII, 
which are reduced two-fifths. 
