List of Illustrations 



PLATES 



FACING 



I. Starfishes and Ophiuran, Asterias forbesi, Henricia 



sanguinolcnta, and Ophiura brevispina 

 II. Skeleton of Starfish, Asterias forbesi 



III. Aboral surface of Starfish, Asterias forbesi 



IV. Oral surface of Starfish, Asterias forbesi 

 V, Anatomy of Starfish, Asterias vulgaris . 



VI. Rate of growth of Starfish, Asterias forbesi 



VII. Variation, Asterias forbesi . 



VIII. Asterias forbesi and Asterias vulgaris 



IX. Asterias vulgaris 



X. Asterias tenera 



XI. Henricia sanguinolcnta 



XII. Variation, Ophiopholis aculeata . 



XIII. Skeleton of Ophiuran, Ophiopholis aculeata 



XIV. Skeleton of Ophiuran, Ophiura brevispina 

 XV. Ophiura brevispina 



XVI. Ophiopholis aculeata 



XVII. Amphipholis squamata .... 



XVIII. A?nphioplus abditus . • 



XIX. Amphioplus abditus and A?nphioplus macilentus 



XX. Sea-urchin, Arbacia punctulata . 



XXI. Skeleton of Sea-urchin, Strongylocentrotus 



bachiensis 



XXII. Anatomy of Sea-urchin, Arbacia punctulata 



XXIII. Skeleton of Disk-urchin, Echinarachnius parma 



XXIV. Anatomy of Disk-urchins, Mellita pentapora and 



Echinarachnius parma . . 

 XXV. Arbacia punctulata .... 

 XXVI. Strongylocentrotus drobachiensis . 

 XXVII. Echinarachnius parma .... 

 XXVIII. Mellita pentapora . 



XXIX. Holothurians, Synapta roseola, Synapta inhcBrens 



and Thyone briareus 



XXX. Anatomy of Holothurian, Thyone briareus 



XXXI. Thyone briareus 



XXXII. Cucumaria pulcherrima, Thyone unisemita, Thyone 

 scabra, and Synapta inhcerens. . 



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