COKALS AND CORAL MAKERS. 



47 



c, the polyps are of the natural size, while figure a represents 

 one of them enlarged, The polyps, as is observed, stand very 

 j)rominent above the cells of the corallum, because only the 

 bases of them secrete coral ; and the buds, which open between 

 the calicles, are hence lateral buds ; the coral has much resem- 

 blance to that of an Orbicella, in which budding is marginal. 



ASTKANGIA DANyE, Ag. 



The tentacles have minute warty prominences over them, 

 which are full of lasso-cells, each about a 500th of an inch in 

 length, or about two-thirds larger than those of the ivhite cords 

 that edge the internal septa. 

 The corallum, though mas- 

 sive, is somewhat irregularly 

 lobed above, and grows to 

 a diameter of two or three 

 inches. It is covered with 

 stars an eighth of an inch 

 to a sixth across (figure b), 

 which are usually crowded 

 the intervening 

 being very thin and 

 solid. The author alluded 

 to the crowd of stars in the 

 name Pleiadia, which he proposed for the genus in his Report 

 on Zoophytes (page 722). 



The genus Cladocora, containing slenderly branching ram.ose 

 zoophytes, is closely related in its polyps, according to 



together, 

 wall 



PHYI.LANGIA AMEKICANA, E. & H. 



