ECHINODERMATA 



73 



star-fish and may even be seen in the photograph (Fig. 23), 

 just below the junction of the two arms which are upper- 

 most. 



I feel that I must apologise for these repeated deviations 

 into matters more strictly biological than I intended, but 

 these few points are essential for a fair understanding of the 



Fig. 29. Echinus mUiarix, at home. Natural size 



objects we come upon in our researches, and I am writing 

 not for the laboratory but for the seaside observer. 



Among the rocks, under boulders, and in crevices, on 

 almost any coast, will be found the common little sea- 

 urchin (Echinus miliaris). This little fellow, shown at 

 home in Fig. 29, is about two inches in diameter. The 

 spines are about half-an-inch long, and are usually of a dull 

 green colour with purple tips. The denuded test in this, 

 as in all the others, is of a pink colour. 



