PLATE XXXVIII. 



Illustrating paper by J. I. Peck and N. II. Harrington on " Ohservation.s 

 on the Plankton of Paget Sound," pp. 377-386. 



Plotting to show vertical distribution of five elements of tlie Plankton. 

 Surface, bottom and three intermediate levels are represented by the horizon- 

 tal lines upon which are laid off widths corresponding to the numbers taken 

 in each case. These widths at the various levels are made the basis for the 

 construction of the several columns which show the facts of distribution. In 

 the first column the black area denotes living portion, and the stippled area 

 the larger species. In the second column black area denotes living material, 

 and the oblique-lined areas the dead and mutilated parts, while the small 

 white bars in the black areas denote the separation of the two type species. 

 In the third column ( 3/e/os/ra) no attempt is made to .show distinction of 

 dead and living material. 



