PLATE XXXIII. 



FIG. 



1. GORGONIA PIXNATA, p. 168, of the natural size. Professor 



Edw. Forbes gave me the specimen. 



2. A portion of the same, with the Polypes extruded, mag- 



nified. 



3. A single Tentaculum of the Polype highly magnified, to 



show the structure. This figure, and the preceding 

 one, are from the drawings of Professor Edw. Forbes. 



4. SARCODICTYON CATENATA, p, 179, of the natural size. 



5. Two of its Polypes; one contracted, and one in a state 



of expansion. 



6. A calcareous Spiculum of the Sarcodictyon. 



7. A Tentaculum, highly magnified. These figures of Sar- 



codictyon are engraved from drawings made from the 

 living animal by Professor E. Forbes. 



8. TUBULIPORA TRUNCATA, p. 27l, of the natural size. From 



specimens of Professor E. Forbes. 



9. The same magnified. 



10. The apertures of the cells more highly magnified. 



