| Fig. 1. | Vertical branch of a polyparium of P. emarginata from Calcutta, to show method of branching (× 8). The specimen was preserved in formalin, stained with hæmalum, and after dehydration and clearing, mounted in canada balsam. |
| Fig. 1 a. | Part of a young, horizontal zoarium of P. emarginata from Rangoon (× 4, preserved in spirit). |
| Fig. 2. | Part of a zoarium of P. diffusa from Gangtok, Sikhim (× 4). See Pl. III, fig. 3. |
| Figs. 3, 3 a. | Specimens in spirit of P. allmani from Bhim Tal (lake), W. Himalayas. Fig. 3 represents a mature polyparium; fig. 3 a a young polyparium to which the valves of the statoblast (×) whence it had arisen are still attached. |
| Fig. 4. | Part of a zoarium of the coralloides phase of P. fruticosa (from Calcutta) preserved in spirit, as seen on the surface of the sponge in which it is embedded (× 3). |
| Fig. 5. | Part of the margin of a living polyparium of P. punctata from Calcutta (× 8) with the polypides fully expanded. |
PLUMATELLA.
[PLATE V.]
Specimens of Plumatella, Stolella, and Pectinatella.
| Fig. 1. | Part of a zoarium of the coralloides phase of P. fruticosa (× 10) from Calcutta. The specimen, which was preserved in spirit, had been removed from a sponge of Spongilla carteri. |
| Fig. 2. | Terminal branch of a polyparium of P. punctata from Calcutta (× 30). The specimen was preserved in formalin, stained with hæmatoxylin, and finally mounted in canada balsam. |
| Fig. 3. | Part of an adult polyparium of S. indica from the United Provinces (× 30). The specimen was preserved in formalin, stained with hæmalum, and finally mounted in canada balsam. The lower zoœcium contains a mature free statoblast, the upper one a fixed one. |
| Fig. 4. | The growing point of a young polyparium of the same species from Calcutta (× 30), to show the method of formation of the stolon that connects the different groups of zoœcia. The specimen had been treated in the same way as that represented in fig. 3. |
| Figs. 5, 5 a. | Zoaria from a compound colony of P. burmanica from the Sur Lake, Orissa (× 2). The specimens, which were preserved in formalin, are represented as seen from the adherent surface of the colony. |
Plumatella, Stolella, Pectinatella..