CCELENTERATA. 



21 



(Hall, Graptolites of the Quebec Series, 1865 ; Nicholson, Monograph of 

 the British Graptolitidce, 1872 ; Lapwortli, Notes on British Graptolites, 

 Geol. Mag., 1873.) 



SUB-CLASS V. HYDROCORALLIISLE. 



Fam. 1. Milleporidse. Millepora (fig. 16). 

 Fam. 2. Stylasteridse. Stylaster, Pliobothrus, Errina, Dis- 

 ticlwpora. 



(H. N. Moseley, Report on certain Hydroid, Alcyonarian, and Madrepo- 

 rarian Corals, Report of the Scientific Results of the Voyage of H.M.S. 

 Challenger, 1881.) 



Fig. 16. Enlarged view of a portion of the surface of a living colony of Millepora nodosa, 

 showing the expanded zoflids of a single system, a, Central " gastrozooid ; " 6, One of the 

 mouthless " dactyl ozooids." (After Moseley.) 



CLASS II. ACTINOZOA. 



ORDER I. ZOANTHARIA. 



Sub-ord. 1. Zoantharia malacodermata, 



Fam. a. Actinidse (Sea-anemones). Actinia (fig. 1*7), 

 Tealia, Sagartia, Mini/as. 



