70 INTRODUCTION TO ZOOLOGY CHAP, v 



Specimens illustrative of each class of Echinoderms 



Stud? snou ld 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). 



