3^4 



COELENTERATA ANTHOZOA 



CHAP. XIII 



this Sea-pen is usually violet when dried or preserved. Specimens 

 of Renilla are very abundant in shallow water in some localities 

 on the Atlantic and Pacific coasts of N. America, but the genus 

 has also been obtained from the Eed Sea and the coast of Australia. 

 A popular name for this genus is " Sea pansy." 



Sect. 4. Veretilleae. This section contains a number of genera 

 in which the bilateral arrangement of the zooids is obscured by their 

 gradual encroachment on the dorsal side of the axial polyp. The 

 rachis and peduncle are thick and fleshy, and the autozooids and 





.-^ 







Fig. 161. Cavernularia 



C Au, autozooid ; Si, siphonozooid ; St, stalk. 

 (After Kolliker.) 



siphonozooids are irregularly distributed all round the rachis. 

 The genus Cavernularia is not uncommonly found in moderate 

 depths of water in the Indian and Pacific Ocean, and is distin- 

 guished from the other genera by the reduction of the skeletal 

 axis. Other genera are Veretillum, Mediterranean and Atlantic 

 Ocean, and Lituaria, Indian Ocean. 



