1902-1903.] Distribution of the Smaller Crustacea. 23 



stituents of the soil there which might be beneficial to this 

 Pink? 



I will only add, in conclusion, that it is certain that no one 

 who considers even the few facts here set forth (to say noth- 

 ing of those given in larger works) can have for a moment any 

 doubt about the important influence exerted by Ants in de- 

 termining much connected with the morphology and habits of 

 flowers. I am myself disposed to regard Bees on the one 

 hand and Ants on the other as two of the most important 

 determining factors concerned in the evolution not only of 

 floral structures but also of much else that is of interest in 

 the world of plants. 



Y.—SOME OBSERVATIONS ON THE DISTRIBUTION 

 OF THE SMALLER CRUSTACEA. 



By THOMAS SCOTT, LL.D., F.L.S., Honorary Member. 



{Read Jan. 28, 1903.) 



The distribution of the Crustacea, and especially of the 

 smaller species, has in recent years been attracting more 

 attention than formerly. That it should do so is not 

 only not surprising, but one is rather inclined to wonder 

 why these minute crustaceans have been so long and so 

 much neglected. For whether we regard their extremely 

 varied and often beautiful forms, or their interesting, and 

 in many cases strange, life-histories, they are found to con- 

 stitute one of the most fascinating studies that can engage 

 the attention of the zoologist. 



In the following observations on the distribution of the 

 smaller species of Crustacea, I shall for the most part confine 

 my remarks to those that have been observed in connection 

 with the investigations which have for a considerable number 

 of years been carried on under the direction of the Scottish 

 Fishery Board. And, Jlrst, I propose to notice, briefly, the 



