CCELENTERATA. 25 



Fam. i. *Ch8etetidse Chcetetes. 



Fam. j. *Monticuliporidse. Monticulipora. 



Fam. L *Auloporidse. Aulopora. 



(Kolliker, Anatomisch-systematische Beschreibung der Alcyonarien, 1870 ; 

 Kolliker, Report on the Pennatulida, Eeport of the Scientific Results of 

 the Voyage of H.M.S. Challenger, 1881 ; H. N. Moseley, Report on certain 

 Hydroid, Alcyonarian, and Madreporarian Corals, ibid., 1881 ; Nicholson, 

 On the Structure and' Affinities of the " Tabulate Corals " of the Palaeozoic 

 Period, 1879.) 



OEDER III. *KUGOSA. 



Fam. a. Stauridse. Stauria (fig. 22), Holocystis. 



Fam. &. Cyathaxonidse. Cyathcuconia. 



Fam. c. Cyathophyllidee. Cyathophyllum, Heliopliyl- 



lum, Zaphrentis. 

 Fam. d. Cystiphyllidse. Cystipliyllum, GoniopJiyllum. 



(Milne-Edwards and Haime, Polypiers fossiles des terrains pale'ozoiques, 

 1851.) 



Fig. 22. A few ealices of Stauria astr&iformis, enlarged, showing the four primary 

 septa forming a four-branched cross. Upper Silurian. (After Milne-Edwards and 

 Haime.) 



ORDER IV. CTENOPHORA. 



Sub-ord. 1. Eurystomata. Beroe, Idyia. 



Sub-ord. 2. Saccatse. Pleurdbrachia, Hormiphora. 



Sub-ord. 3. Lobatse. Bolina. 



Sub-ord. 4. Tseniatse. Cestum (Venus's Girdle, fig. 23). 



