130 SYNOPTIC COLLECTION. 



The shorter mesenteries bear long filaments which are 

 provided with thread cells, and which can be thrown out 

 of the mouth and through openings in the body wall. 



Actiniae generally reproduce in the manner already de- 

 scribed, but occasionally they increase by budding and 

 by fission. No. 202 is a rare specimen of Metridium 

 which has two mouths in the oral disc. When a constric- 

 tion takes place between these two and the oral disc 

 divides, the method of fission is illustrated, and two ani- 

 mals are produced which in No. 203 have not separated. 



There are a number of different genera of Actiniae in 

 the Collection illustrating interesting features. 



Ammonia sulcata (No. 204), is remarkable for its short 

 body and its numerous large, long tentacles which float in 

 the water like hungry food catchers. 



The slit-like mouth with thickened lips peculiar to 

 anemones is well seen in Adamsia rondeleti (No. 205). 

 This anemone has the habit of fastening itself to the 

 inner part of the opening of a Gastropod shell, as shown 

 in No. 205 ; the bases of the different animals often touch 

 one another, but there is no organic connection. One 

 species of this genus (A. palliatd) is found as a messmate 

 on the back of the crab, Pagurus prideauxi. 



Anthea cereus Johnst. (No. 206), has little power of 

 drawing in its tentacles, which are placed at the junction 

 of the body wall and the oral disc. The exquisite color- 

 ing of Actiniae is illustrated by all the glass models of 

 these animals but especially by this species of Anthea. 



Bunodes crispa Ehr. (No. 207), is a rare anemone. The 

 surface of the upper part of the body has many warts 

 which are used as suckers for mooring the animal or for 

 the attachment of foreign particles. 1 There is an indefi- 

 nite number of retractile tentacles, some small and others 

 so large and long that they look like grasping organs. 

 Suctorial warts similar to those of Bunodes are also found 

 in Tealia crassicornis Mull. (No. 208). 



'Proc. Roy. Dublin Soc., VI, 1889, p. 315. 



