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MR. J. S. BOWERBANK ON THE STRUCTURE OF THE CORALLIDiE. 
Explanation of the Plates. 
PLATE XVI. 
Fig-. 1. Vascular tissue with ceecoid appendages. Millepora alcicornis. 
Fig. 2. Large vascular tissue with valves a a at the entrance to the vessels with 
csecoid appendages, and at b, upon the main trunk of the vessel. Mille- 
pora alcicornis. 
Figs. 3, 4. Large vascular tissue with valves, from Cellepora pumicosa. 
Fig. 5. Branched and cellulated vascular tissue, from Pavonia Boletiformis. 
Fig. 6. The same tissue with ovoid bodies at the apex. 
Fig. 7- Large brown, round or oval bodies, with monilifortn vessels, from Pavonia 
Boletiformis. 
Fig. 8. Siliceous spicula and cytoblasts imbedded in the membranous tissue of 
Anthopora. 
PLATE XVII. 
Fig. 1. Strings and groups of cytoblasts from Millepora alcicornis. 
Fig. 2. Vessel continued by cytoblasts from Millepora alcicornis. 
Fig. 3. Membranous sacs with cytoblasts at their apices, and minute vascular tissue 
with csecoid branches terminated by cytoblasts. Cellepora pumicosa. 
Fig. 4. One of the membranous sacs of the same, magnified 800 linear. 
Fig. 5. Cellular structure in a Nullipora from Sydney, Australia, exhibiting the 
ends of the cells with the cytoblasts at the apices. 
Fig. 6. A lateral view of the same tissue, with the cells empty. 
Fig. 7- A single cell uncompressed, from the same, with the cytoblast at the apex. 
Fig. 8. Fibro-vesicular tissue from a species of Agaricia, nearly allied to A. am - 
pliata. 
Fig. 9. Two cytoblasts from Anthopora, magnified 800 linear. 
