EXPLANATION OF PLATE 54. 89 



Miller considers to have sent off ten branches at 

 every joint, five to the interior and five to the exte- 

 rior of the petals. 



Fig. 14. One of the largest auxiliary side arms. Some 

 of these contained more than 100 joints. See V. I. 

 p. 438. (Goldfuss.) 



a, hy c. represent different forms of the joints at different 

 parts of the side arms, with their nicely adjusted 

 articulating surfaces. 



Figs. 15, 16, «, hy &c. Various modifications of the 

 articulating surfaces of the joints composing the 

 fingers and tentacula. (Goldfuss, PI. LI.) 



Fig. 17. Magnified extremity of one of the tentacula. 

 The two last joints form a very delicate pair of pin- 

 cers, to lay hold on its prey. (Original.) 



Plate 54. V. I. p. 442. 



Fig. 1. Caryophyllia arbuscula, nat. size, with the ani- 

 mals expanded. (Mem. du Mus. d'Hist. Nat. Tom. 

 6, PI. 15, f. 2.) 



Fig. 2. The animal of Fig. 1. magnified ; as seen from 

 above. 



Fig. 3. Vertical section of the cup of Meandrina laby- 

 rinthica, with the animal placed within it. (Mem. 

 du Mus. d'Hist. Nat. Tom. 6, PI. 16, 10 b.) 



Fig. 4. a. The common Actinia, or Sea Anemone, ex- 

 panded, h. The same contracted within its external 

 skin. (Encyc. Method. PL 72. 6.*) 



Fig. 5. Madrepora gyrosa. (Ellis. Zooph. Tab. 51, 

 Fig. 2.) 



* This animal has no calcareous cell, but contracts itself into a 

 tough fleshy sac, see Fig. 4 h. At a. the Tentacula are represented 

 in a state of expansion. Some of these Polypes present the same 

 display of brilliant colours as many of those which construct per- 

 sistent calcareous cells. 



