OF SEA-ANEMONES. 91 



genera. But all my observation goes to prove that 

 the genera Sagartia and Biinodes have tubercles 

 in common, agreeing in their use as sucking- 

 glands, and disagreeing only in size and distribu- 

 tion. I can also prove that Sagartia possesses 

 certain invisible pores or channels through which 

 the missile filaments are expelled and retracted. 



By capsuliferous spherules are meant the blue beads 

 which are inside the upper margin of the body, and 

 which contain the capsules or spike-cases spoken of 

 in Chapter III. 



" Bunodes (Gosse). Body adherent, cylindrical, 

 studded with warts ; skin leathery ; not emitting 

 missile filaments — nettling threads long and simple ; 

 tentacles generally thick, conical, obtuse. 

 B, gemmacea. 

 „ thallia. 

 „ clavata. 

 „ crassicornis." 

 This genus corresponds with Group II. 

 " Nettling-threads " are the "si)ikes" mentioned 

 in Chapter III., and figured, together with their 

 cases, in Plate II., fig. 1. B. crassicornis is the 

 "thick-skinned" of the text, which I have ventured 

 to designate coriacea for reasons there given. 



"Sagartia (Gosse). Body adherent, cylindrical, 

 without a skin ; destitute of warts ; emitting capsuli- 



