MUSEUM 01' COMPARATIVE ZOOLOGY. 19^ 



EXPLANATION OF THE PLATES OF ECHINL 



PLATES L — IL 

 Conoclypus Sigsbei A. Ao. 

 Plate I. 

 Fig. 1. Profile, seen facing the anterior extremity, natural size. 

 Fig. 2. Profile seen from the left side. 



Plate II. 

 Fig. 1. Seen from above, natural size. 

 Fig. 2. Seen from the actinal sitle, natural size. 



PLATE III. 



Periaster limicola A. Ao. 



Fig. 1. Seen in profile. 

 Fig. 2. Seen from above. 

 Fig. 3. Seen from above, denuded. 

 Fig. 4. Seen from below, denuded. 

 All figures natural size. 



PLATE IV. 



Dorocidaris Blakei A. Ao. 



Fig. 1. Seen in profile. 

 Fig. 2. Seen from above. 

 Fig. 3. Seen from below. 

 All figures natural size. 



PLATE V. 



Saleuia Pattersoni A. Aa. 



Fig. 1. Seen in profile. 

 Fig. 2. Seen from above. 

 Fig. 3. Seen from the mouth side. 

 All figures natural size. 



