25 



GENUS II. SAGARTIA (Gosse). 



Actinia (Linn.). 



Cribrina (EhrenbA 



Actinocereus (Blainv.). 



Base broader than the column ; its outline often 

 undulate, but entire. 



Column in the expanded state pillar-like, sometimes 

 low and thick, sometimes tall and slender ; the 

 margin notched or tentaculate, without parapet or 

 fosse. Surface studded with suckers, which do not 

 form permanent warts ; pierced with loopholes. Sub- 

 stance fleshy, or pulpy. 



Disk sometimes wavy ; more commonly plane, some- 

 times slightly turned-over at the edge. 



Tentacles varying in number, form, and arrangement 

 in the different species. 



Mouth generally elevated on a more or less con- 

 spicuous cone; furnished with two gonidial grooves, 

 each with its pair of turbercles. 



Acontia emitted freely and copiously. 



NATURAL ORDER OF TEE BRITISH SPECIES. 



1. bellts. 



2. miniata. 



3. rosea. 



4. ornata. 



5. ichthy stoma. 



6. renusta. 



7. nivea, 



8. sphyrodeta. 



9. pallida. 



10. troglodytes. 



11. viduata. 



12. p>ava$itica. 



