1817.] EXPLANATION OF PLATES. 187 



viii. compared with the figures 10, 11,12, which represent 

 the madreporic animals, Caryophyllia solitaria, Meandrina 

 labyrinthica? and Astrea dichotoma, 



EXPLANATION OF THE PLATES VII. ANB VUL 

 PLATE VII. 



Fig. I. Actinia olivacea, expanded, as it swims. 



Fig. 2, The disc of the same. 



Fig. 3. Tentacula, magnified, of the same. 



Fig. 5. Actinia ultramarina, beginning to expand. 



Fig. 6. Vertical section of the same: a, cavity of the air- 

 bladder disc; b, air-bladder disc; c, great cavity 

 containing the ovaries; e/,c/, the stomach; ^,^, 

 the tentacula contracted; Jl section of lateral 

 organ. 



Fig. 4. Horizontal section of the same: a, chamber which 

 separates the great cavity; b, extremity of late- 

 ral organ; c, the ovaries; d, point of junction 

 of the interior organs with the exterior furrows; 

 Jlf, striae of the plaits of the divisions. 



Fig. 7. a, Portion of the mouth viewed above. 



Fig. 8. Actinia fiava^ in its natural position, when swim- 

 ming. 



Fig. 9, Profile of the same, opened on the side: a,a,a, ova- 

 ries turned over the air-bladder disc; ^, trans- 

 verse striae of the interior longitudinal organs; 

 c, section of a tentaculum; of, stomach. 



Fig. 7. b, Portion of the mouth and stomach of the same, 

 magnified. 



