DESCRIPTION OF THE PLATES. 61 



PLATE XIX. 

 Figs. 1, 2. Plumularia megalocephala. 



Fig. 1. Natural size. 



Fig. 2. A portion of a brancli with pinna-, magnified. 



Figs. 3-7. Halopteris carinata. 



Fi": 3. Entire colony, natural size. 



Fif. 4. Portion of stem with pinna;, magnified. 



Fig. 5. Portion of a pinna, still further magnified ; lateral view. 



Fig. 6. Same, front view. 



Fig. 7. Same, back view. 



PLATE XX. 



Figs. 1-4. Plumularia geminata. 



Fig. 1. Natural size. 



Fig. 2. A portion, magnified. 



Fig. 3. A portion, still further magnified ; front and back view of pinnae. 



Fig. 4. Lateral view of pinna. 



PLATE XXI. 



Figs. 1, 2. Antennularia simplex. 

 Fig. 1. Natural size. 

 Fig. 2. A portion, magnified. 



Figs. 3-6. Antennopsis hippuris. 



Fig. 3. Natural size. 



Fig. 4. A portion, magnified ; with male (?) gonangia. 

 Fig. 5. Portion of a pinna, still further magnified. 

 Fig. 6. Portion of a colony with female (?) gonangia. 



Figs. 7, 8. Hippurella annulata. 



Fig. 7. Entire colony, natural size. 



Fig. 8. Portion of a branch with pinnae, magnified. 



PLATE XXII. 



Figs. 1-5. Mouostaechas dichotoma. 



Fig. 1. Entire colony, natural size. 

 Fig. 2. A portion, magnified. 



Portion of a pinna, still further magnified; front view. 



Same, lateral view. 



Young gonangium. 



Figs. 6, 7. Anteunella gracilis. 



Entire colony, natural size. 



One of the pinna-like stems, magnified. 



PLATE XXIII. 



Figs. 1-4. Aglaophenia ramosa. 



Fig. 1. Natural size. 



Fig. 2. Portion of a branch with pinna;, magnified. 

 Fig. 3. Hydrotheca, still further magnified ; front view. 

 Fig. 4. Same, lateral view. 



Figs. 5-8. Aglaophenia rhynchocarpa. 



Fig. 5. An entire colony, natural size. 



Fig. 6. Portion of a pinna, magnified ; lateral view. 



Fig. 7. Hydrotheca of same ; front view. 



Fig. 8. Corbula, magnified. 



