MANUAL OF NATUKAL HISTORY. 355 



tacles tubular ; stomach membranous, plaited ; ovi- 

 parous ) ovaries internal. 



1. FAMILY. Sea-Anemones (Actiniidse). Polyps 



fleshy, soft, separate, single ; ovi-viviparous ; 

 mouth with several rows of simple or branched 

 tentacles. 



2. FAMILY. Lucernarians (Lucernariidse). Polyps 



companulate, fixed by a narrow stalk, in the 

 centre of an umbrellar expansion ; tentacles 

 in tufts. 



3. FAMILY, Animal-Flowers (Zoanthidae). Polyps 



coriaceous, incrusted or solidified by foreign 

 bodies ; gemmiparous ; associated by a com- 

 mon base. 



4. FAMILY. Pocillopores (Pocilloporidse). Polypary 



solid, spinulose or granulated ; polyp-cells 

 circumscribed, ridged, 6-sided, shallow, cili- 

 ated or spinulose ; polyp with few tentacles, 

 in a single series. 



5. FAMILY. Stylasters (Stylasteridae). Polypary 



minutely porous ; polyp-cells deep, cylindri- 

 cal, with six grooves, each ending in a pore 

 and a central style ; polyp with few tentacles, 

 in a single series. 



6. FAMILY. Madrepores (Madreporidse). Polypary 



spongy, porous, rough ; coral cells deeply cir- 

 cular, with 6 or 12 longitudinal folds, im- 

 mersed or produced, sub-cylindrical, without 

 any central style ; tentacles in a single series. 

 "7. FAMILY. Porites (Poritidse). Polypary very 

 ' porous, spongy, rough ; polyp-cells many- 



