1 84 W. C. ALLEE. 



Habitats. Number of Species. 



Flats, rocks, pilings and dredgings 54 



Flats, rocks and pilings 16 



Rocks, pilings and dredging 10 



Flats, pilings and dredging 3 



Flats, rocks and dredging 9 



Flats and under or on rocks 26 



Wharfs and rocks 8 



Flats and rocks n 



Dredging and rocks 5 



Flats and pilings 2 



Pilings and dredging 2 



Flats and dredging 9 



Flats, under rocks and dredging 4 



On or under rocks 10 



Pilings 7 



Dredging 13 



Only under rocks 1 



Flats 41 



The analysis shows that at the close of the 1920 season 54 

 species had been recorded from all four types of habitats studied 

 while only 16 species were limited to and found in all of the three 

 habitats excluding dredging. The flats have the greatest number 

 of peculiar species, with 41, and but few forms are limited to 

 any one of the other habitats. 



The same material analyzed in another fashion is shown in 

 Table 1. Here the attempt is to show the total numbers of 



Table I. 



Wharfs . . 



Flats 



Rocks. . . 

 Dredging 



Dredging. 

 (26 only in Harbor) 



(28 only in Harbor) 



(22 only in Harbor) 



(32 only in Harbor) 



animals found in each of the four major divisions of the littoral 

 zones of the region in comparison with each of the other divisions. 



1 30 more dug occasionally among or under rocks. 



