INTEODUCTION. CXXXIX 



Family XV. — Celleporidse. 

 CelleporAj Fabricius (part). 



Suborder II.— CYCLOSTOMATA, Busk. 

 Zooecia tubular, with a jilain iuoperculate orifice. 

 Marsupia and appendicular organs wanting. 



Group i. — Rabicellata, D'Orbigny. 



Family I. — CrisiidaB. 



Crisia, Laraouroux (part). 



Group ii. — Incbustata, D'Orbigny. 



Family II. — TubuliporidsB. 



Entalophora, Lamou- 



roux. 

 DiASTOpoRAj Lamx. (pt.) . 



Stomatopora, Bronn. 

 TuBULiPORA, Lamarck 

 Idmonea, Lamouroux. 



Family III. — Hornerida9. 

 HoRNERA, Lamouroux. 



Family IV. — Lichenoporidse. 

 LicHENOPORA, Defrance. | Domopora, D^Orbigny. 



Suborder III.— CTENOSTOMATA, Busk. 



Orifice of the zooecium closed by an opercidum of setse. 

 Zoarium never calcareous. Marsupia wanting. 



Group i. — Halctonezlea, Ehrenberg. 



Family I. — AlcyonidiidsB. 

 Alcyonidium, Lamouroux. 



MoUusca was so called by Artbxir Adams in 1863, and Mr. Kidley (of the 

 British Museum), to whose kind assistance I am much indebted, informs 

 me that the name still holds its place in moUuscan nomenclature. I have 

 therefore adopted the form Umhomda. 



