Explanation of Plates. 
483 
EXPLANATION OF PLATES. 
PLATE VII. 
Fig. 1. General view of the dredge. See pp. 424-428. 
Fig. 2. Upper cylinders of bucket and collecting tube. 
Fig. 3. Bucket, stopper, and collecting tube. 
PLATE VIII. 
Fig. 1. Full sized section through front of frame of dredge 
and part of cover, which is slipped back from frame. 
A, frame; B, support for guide; C, guide; D, cover; E, 
flange of cover. The flange is slightly turned up at its front 
edge, so that it will not strike the guide as the cover closes; 
G, eyelet for cover-cord; H, pulley; I, support for pulley; J, 
eye on cover for attachment of cord; K, cylinder for attaching 
dredge net; M, guide for cover. 
A section through the side of the frame would be substantially 
the same except that the cover would be in the groove below C 
and the flange E would not be turned up on the edge. 
Figs. II-VIII. Graphic representation of the general dis¬ 
tribution of the Crustacea. The size of the circles is proportional 
to the number from the entire depth or from each level. Each 
circle is divided into sectors proportional to the number of each 
kind of Crustacea. See p. 445, Table E. 
PLATE IX. 
Fig. 1. Graphic representation of the percentile distribution 
of the Crustacea during the month of July. Each vertical line 
in the diagram represents two per cent, of the total catch and 
each horizontal line one meter of depth. The percentage of the 
whole number of each species yielded by each 3 m. level is in¬ 
dicated by a circle placed at the center of the level. The circles 
or dots for each species are connected by lines. 
d, Diaptomus ; c, Cyclops; h, Daphnia hyalina; p, Daphnia 
pulicaria. 
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