1 N IIIODUCTION. CXXX1X 



Family XV. Celleporid.se. 

 CELLEPORA, Fabricius (part). 



Suborder II. CYCLOSTOMATA, Busk. 

 Zooecia tubular, with a plain inoperculate orifice. 

 Marsupia and appendicular organs -wanting. 



Group i. RADICELLATA, D'Orbigny. 



Family I. Crisiidae. 

 CRISIA, Lamouroux (part). 



Group ii. INCRUSTATA, D'Orbigny. 

 Family II. Tubuliporidaa. 



STOMATOPORA, Bronn. 

 TTJBULIPORA, Lamarck. 

 IDMONEA, Lamouroux. 



ENTALOPHORA, Lamou- 



roux. 



DIASTOPORA, Lamx. (pt.). 



Family III. Homeridse. 

 HORNERA, Lamouroux. 



Family IV. LiclienoporidaB. 

 LICHENOPORA, Defrauce. | DOMOPORA, D'Orbigny. 



Suborder in. CTENOSTOMATA, Busk. 



Orifice of the zooecium closed by an operculum of setae. 

 Zoarium never calcareous. Marsupia wanting. 



Group i. HALCYONELLEA., Ehrenberg. 



Family I. Alcyonidiidae. 

 ALCYONIDIUM, Lamouroux. 



MoUiuca wu to called by Arthur Adams in 1863, and Mr. Ridley (of the 

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

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

 then-fore adopted the form Umbomila. 



