MANUAL OF NATURAL HISTORY. 355 



tacles tubular ; stomach membranous, plaited ; ovi- 

 parous j ovaries internal. 



1. Family. — Sea-Anemones (Actiniidse). Polyps 



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

 mouth with several rows of simple or branched 

 tentacles. 



2. Fajviily. — Lucernarians (Lucernariidse). Polyps 



companulate, fixed by a narrow stalk, in the 

 centre of an umbrellar expansion ; tentacles 

 in tufts. 



3. Family. — Animal-Flowers (Zoanthidse). 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. 

 f>. Family. — Stylasters (Stylasteridse). 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. — Forties (Poritidse). Polypary very 



porous, spongy, rough ; polyp-cells many- 



