278 EXPLANATION OF 



Fig. 4. Sertularia arhuscula, p. 84. i 



i 



a. The natural size. I 



B. Branch with its cells, magnified. ! 



C. Ovarium. j 



5. Idiapristis, p. 87. j 



a. Of the natural size. ! 



B. The front of a branch, magnified. I 



C. The back ditto. 



I 



D. An insulated cell, greatly magnified. | 



E. Transverse cut of a magnified branch. 



I 



6. Clytia urnigera, p. 89. j 



a. Of the natural size. ■ 



B. Cells magnified. \ 



C. Ovarium. 



PLATE VI. i 



I 



I 



Fig.l. Laomedea AntipatheSj p. 90. j 



a. Of the natural size. ; 



B. Fragment of a branch, magnified. \ 



2. Thoa Samgnii, p. 93. ' 



a. The natural size. i 



B. Branches magnified. j 



C. Ovaria. | 



3. Salacia tetracyttara, p. 93. 



a. The natural size. i 



B. The lower part of a branch, magnified. j 



C. Ovarium. ' 



4. Naisa reptans, p. 99. \ 



A. This figure was copied from Trembley^ j 



5. Naisa lucijuga, p. 99. " 



A. Copied from Vaucher. ' : 



