BRITISH ZOOPHYTES. 55 



and development of tliis species, and has noted his 

 researches in his " Gymnoblastic Hydroids/^ p. 216. 

 He describes it as the first species "in which the entire 

 life-series was followed through the complete succession 

 of polypite, medusa, and planula, and back again to the 

 polypite.^' 



Genus II. Staurididm, Dujardin. 



Stems as in last genus. Polypites subcylindrical, with 

 several verticils of capitate tentacula arranged in the 

 form of a cross. Also a row of proximal rigid tentacles.* 

 Gonozooid has 4 radiating canals. — T. H. 



1. S. PRODUCTUM, T. 8. W. Plate III. fig. 3. 



Stauridia producta (T. 8. W.), Coryne Cerberus 

 {P.H.G.,McA.). 



Hab.: Ilfracombe (T. E.), Firth of Forth {T. 8. 

 W.), Penzance {All.). Height i in. Polypites white, 

 cylindrical, with 12 capitate tentacles disposed in three 

 cruciform equidistant rows. Proximal tentacles rigid, 

 tapering to a blunt point. The capitate tentacles in- 

 crease from 2 — 12 according to age. 



Mr. Gosse, under the name of the " three-headed 

 Coryne," describes an immature specimen of this 

 species.f The body of the polypite is stated by him 

 to be very mobile, and the mouth is capable of being 

 used as a sucker. 



Genus III. Vorticlava, Aid. 



Polypites borne on simple stems, developed at 

 intervals on a creeping filiform stolon, destitute of a 

 continuous polypary. Tentacles in two dissimilar ver- 



* Mr. Hincks calls these " false tentacles." 

 t " Devonshire Coast," p. 222. 



