58 DESCKIPTIOX OF THE PLATES. 



PLATE VI. 



Figs 1, 2. Obelia marginata. 

 Fig. 1. Natural size. Drawn from a small specimen. 

 Fig. 2. A branch, magnified. Creeping over it is a colony of Lafoea venusta. 



Figs. 3, 4. Lafoea venusta. 



Fig. 3. Natural size. It is seen creeping over a branch of Obelia marginata. 

 Fig. 4. A portion, magnified, creeping over Obelia marginata. 



Fig 5, 6. Thyroscyphus ramosus. 

 Fig. 5. Natural size. 



Fig. 6. A portion of a branch, magnified. 



PLATE YII. 



Figs. 1-3. Oplorhiza parvulet 

 Fig. 1. Natural size. 

 Fig. 2. Portion of a colony, magnified. 



(a, a) Hydrorhizal appendages. 

 Fig. 3. One of the hydrorhizal appendages, still further magnified. 



Figs. 4, 5. Obelia longicyatha. 

 Fig. 4. Natural size. 

 Fig. 5. Portion of a colony, magnified. 



PLATE VIII. 



Figs. 1, 2. Campauularia macroscypha. 

 Fig. 1. Natural size. 

 Fig. 2. Portion of a colony, magnified. 



Figs. 3, 4. Lafoea tenellula. 

 Fig. 3. Natural size. 

 Fig. 4. Portion of a colony, magnified. 



Figs. 5, 6. Cuspidella pedunculata. 

 Fig. 5. Natural size. 

 Fig. 6. Portion of a colony, magnified. 



PLATE IX. 



Figs. 1, 2. Lafoea convadlaria. 



Fig. 1. Entire colony, natural size. 



Fig. 2. Distal portion of a colony, magnified. 



PLATE X. 



Figs. 1, 2. Lafoea cocilesceus. 



Fig. 1. Entire colony, natural size. 

 Fig. 2. The same, magnified. 



PLATE XI. 



Figs. 1-4. Halecium filicula. 

 Fig. 1. Natural size. 



Fig. 2. Portion of a i)inna with hydranth, magnified. . 



Fig. 3. Portion of main stem near its distal extremity, carrying hydrophores and a pinna ; magnified. 



Fig. 4. Distal extremity of a hydrophore with double margin, still further magnified. 



Figs. 5, 6. Halecium capillare. 

 Fig. 6. Natural size. 



Fig. 6. Portion of a branch, magnified. 



