242 Dr. Johnston's Catalogue of Zoophytes. 



1. Actinia. Body conoidal or cylindrical, adhering by a broad base; mouth terminal, 

 dilatable, and retractile ; tentacula numerous, surrounding uninterruptedly the oral 

 disk. 



2. Lucernaria. Body anomalous, adhering by a narrow stalk; mouth in the centre of an 

 umbrellar expansion ; tentacula on the margin disposed in tufts, the apices tipped with a 

 gland. 



Ord. 2. NATANTIA. 



Char. Polypes compound ; the common body or polypidom nomade, fleshy, strengthened 

 with an internal inorganick cartilaginous or osseous axis. 



3. Pennatula. Polypidom plume-like, naked beneath, pinnate above; the axis osseous. 

 Pinnae two-ranked, spreading, flattened, plaited, and polypiferous on the upper margin. 



Ord. 3. TUBULIFERA. 



Char. Polypes compound ; polypidom fixed, coriaceous, internally fibroso-gelatinous ; polype- 

 cells subcutaneous. 



4. Lobularia. Polypidom with a coriaceous skin marked with stellated pores ; interior 

 perforated with longitudinal tubes terminating in polype-cells. Polypes entirely retrac- 

 tile, with eight tentacula. 



5. Alcyonium. Polypidom with a sponge-like or fleshy skin ; interior irregularly cellular. 

 Polypes in prominent cells, entirely retractile, with more than eight tentacula. 



Ord. 4. THECATA. 

 Char. Polypidom plant-like, fixed, horny or calcareous, tubular, filled with a soft medulla 

 connecting the polypes together. Polypes issuing from the ends of the branches, or placed 

 in distinct cells. 



* Polypidom horny. 



6. Tubularia. Polypidom simple or branched ; the polypes proceeding from the end of 

 the tubes, and crested with non-retractile filiform tentacula, circularly disposed. 



7. Coryne. Polypidom simple or branched, slender, the extremities of the branches swol- 

 len, and armed with non-retractile tentacula, irregularly disposed. 



8. Campanularia. Polypidom simple or branched, slender, jointed. Polypes in bell- 

 shaped cells supported on ringed or twisted footstalks. Ovaries vesicular. 



9. Sertularia. Polypidom simple or branched, slender, jointed. Polypes in sessile promi- 

 nent denticles or cells, disposed on the sides both of the stem and branches. Ovaries 

 vesicular. 



10. Plumularia. Polypidom branched, jointed ; stem smooth ; branchlets pinnate, celle- 

 ferous ; the cells sessile, disposed on one side. Ovaries vesicular. 



11. Antennularia. Polypidom simple or branched, jointed, clothed with hair-like branch- 

 lets arranged in whorls ; polype cells prominent, sessile, disposed in a single series along 

 the branchlets. Ovaries vesicular. 



