PLATE 23. 



Anthophysa rosea. 



Fig. 1. Radial dorsoventral section of the entire colony. The thin wall of the lower part of the 

 pneumatosaccus is torn. For lettering see PI. 22, fig. 4. From a photograph. X 25. 



Fig. 2. Radial section of the pneumatosaccus at the region where the secondary ectoderm (Ec') 

 originates. En, endoderm; Ec', primary ectoderm; S. L, stutzlamella. X 150. 



Fig. 3. Bract, with its muscular lamella (L. Mu). X 10. 



Fig. 4. Mature tentillum of dendritic type. X 30. 



Fig. 5. Lower surface of denuded corm, to show the positions of siphons (S), palpons (P), gono- 

 dendra (Go), and of the group of muscular lamellae (L. Mu). Only the stumps of the various append- 

 ages remain. X 10. 



Dromalia alexandri. 



Fig. 6. Lateral view of Type. From a photograph. Only one young nectophore is intact (B. N), 

 but the muscular lamellae (L. Mu) show the positions of the older ones. Immediately below the youngest 

 nectophore are the buds for future siphons (B. S). The aurophore is seen at X, opposite the zone of 

 prohferation. From a photograph. X 2. 



Fig. 7. Dorsal view of another specimen, showing the aurophore (X), the muscular lamellae, 

 and the cormidia. Immediately below the aurophore is a naked zone reaching the entire length of the 

 nectosome. From a photograph. X 2.5. 



Fig. 8. Apical view of part of the pneumatophore, showing the gelatinous prominences. From 

 a photograph. X 2. 



Fig. 9. A compound cormidium, consisting of two siphons (S', S') with their tentacles (T) and 

 several gonodendra (Go', Go=) with palpons, all situated on a single gelatinous prominence (St). X 5. 



Fig. 10. A young tentillum. X 50. 



Fig. 11. Basal view of the axial region of the siphosome, showing the spiral arrangement of siphons 

 (St. S) and canals (C). Photographed from a dissection cleared in clove oil. X 4. 



