70 INTRODUCTION TO ZOOLOGY chap, v 



„ , Specimens illustrative of each class of Echinoderms 



Ct6]161?3.1 



study should be searched for at the seaside. Dredging is 



necessary to obtain Crinoids, but representatives of 



each of the other classes may be obtained in rock pools between 



tide-marks. Identifications can be made with the aid of Forbes's 



British Starfishes and other Echinodermata (1841). 



