XIV ZOANTHARIA ACTINIARIA 383 



to warrant its removal to another division of the Actiniaria. It 

 is found in tide pools attaclied to rocks, but is usually partially 

 hidden by adherent sand or small stones. 



Fam. 7. Minyadidae. — This family contains a number of 

 floating Anemones. The basal disc is folded over to form a gas 

 bladder lined by a cuticular secretion. The species are principally 

 found in the seas of the southern hemisphere. 



Sub-Order 2. Stichodactylina. 



Fam. 1. Oorallimorphidae.- — In this family the marginal 

 cycle of tentacles and accessory tentacles are all of the same kind. 

 The accessory tentacles are arranged in radial rows. All the 

 tentacles are knobbed at the extremity. The musculature is 

 weak. Capnea sanguinea, Gorynactis viridis, and Aureliania 

 heterocera belong to the British fauna. They are all small 

 Anemones of exquisite colours, but are not very common. The 

 genus Corallimorphus is principally found in the southern 

 hemisphere. 



Fam. 2. Discosomatidae. — The tentacles are all of one kind 

 and are very numerous. The mesenteries are also very numerous. 

 The sphincter muscle is strong. 



This family includes a rather heterogeneous assembly of forms, 

 and will probably require some rearrangement as our knowledge 

 increases. Nearly all the species are found in the shallow waters 

 of the tropics, and among them are to be found some of the 

 largest Anemones of the world.' Stoichactis kenti, from the 

 Barrier Eeef, is from one to four feet in diameter across the disc. 

 In the West Indies these Anemones do not attain to such a great 

 size, but Homostichanthus anemone from Jamaica is sometimes 

 S inches in diameter. 



Fam. 3. Rhodactidae. — In this family the body- wall is 

 smooth and the oral disc greatly expanded. The tentacles are 

 of two kinds. On the margin there is a single cycle of minute 

 tentacles, while on the disc there are numerous tuberculate or 

 lobed tentacles. Many of the species of this family are quite 

 small, but Actinotryx mussoides from Thursday Island has an 

 oral disc 8 inches in diameter. The genera and species are 

 widely distributed in the warm, shallow waters of the world. 



Fam. 4. Thalassianthidae. — The tentacles are simple or 



