100 GUIDE TO THE AUSTRALIAN MUSEUM. 



Family III. Camjoanulariidoi. — Either simple or 

 branched, tlie hydrothecE© forming terminal cups to the branches. 

 Species of this and the preceding family are obtainable both in 

 Port Jackson and on seaweeds at some of the outer beaches, Idia 

 pristis excepted. Specimens exhibited are Camjjamdaria tincta, 

 Obelia genicidata, Eucopella camjKimdaria, Lineolaria sj^imdosaj 

 and Lafoea scandens. (See Case 17.) 



Division II — ACTINOZOA. 



Class IV.— ZOANTHARIA.— In this class %ye have the 

 Sea Anemones, and the true corals. These have the mouth sur- 

 rounded by a series of tentacles numbering either six or some 

 multiple of six ; they possess a tubular digestive cavity separated 

 from the body walls by the perivisceral space, which is subdivided 

 into a number of compartments by a series of vertical lamellae, 

 or folds. They are separated into three orders : — 



1. — ActinidaG, the members of wiiich are the well known Sea 

 Anemones, and are characterised by having the power of 

 motion, by being rarely compound, and by an absence of 

 hard parts, or corallum : the family is represented by a 

 series of glass models, and a number of specimens from 

 the Zoological Station of Naples, exhibited in Cases 

 1 and 16. 



2. — Antipathidae. — These are simple or branched polyp stocks 

 with an internal horny skeleton, and, having the mouth 

 surrounded by six tentacles. A fine example from North 

 Australia, Antipathes cupressus, may be seen in Case 15. 



3. — Madreporaria. — Corals with a continuous calcareous 

 skeleton, classified in two sections. 



Section (A) Aporosa. — In this section are included — 



1. The Tnrbinolidce, which mo.stly consist of single corals with 

 a well-developed calcareous corallum, having very distinct 

 septa and an imperforate covering or theca. Examples — 

 Flahellum sp., Caryophyllia smithii. (See Case 9.) 



