314 APPENDIX III 



to the line of low-tide mark ; consequently, a well-marked 

 zoning of species is not apparent, except towards the foot 

 of the cliff on the right. Thus, there is little difference in 

 the composition of the fauna of the portions numbered 

 4, 5, and 6, respectively, which were really more or less 

 arbitrarily chosen. Zone 3 marks a different physical 

 type, sand here taking the place of boulders. On the other 

 hand, in the lower, west-to-east, section, this being taken 

 at right angles to the line of the advancing tide, zoning is 

 much more pronounced. The succession of brown seaweeds 

 here should be compared with that illustrated on Plate VIII. 

 An ecological feature which deserves attention is that the 

 zoning on the two sides of the reef, close to low-tide mark, 

 repeats exactly that found on the other portion of the shore. 

 This is an example of the vertical zoning, as distinct from the 

 linear zoning, to which allusion was made on p. 12. With 

 regard to the fauna, that of zones 1-3 in the lower profile 

 is practically the same as that of 1-2 in the upper one ; 

 similarly, that of zones 4-5 in the lower corresponds approxi- 

 mately to that of zone 3 in the upper. The two profiles 

 intersect at a point equivalent to the middle of zone 3 in 

 the upper section and the beginning of zone 6 in the lower, 

 consequently the list of species is the same in the two cases. 

 The student who attempts to carry out for himself a 

 survey of this type will obtain valuable assistance from the 

 paper describing a method for the study of the ecology of 

 the sea-shore by Prof. L. A. L. King and Dr. G. S. Russell 

 (Proc. Roy. Soc. Edin. XVIII, 1909). 



