CLAVA NODOSA. 249 



GONOSOME.— GoNOPiiORES in shortly pedunculated clusters aggregated imme- 

 diately beliind the posterior tentacles, or occasionally with the clusters detached from 

 one anotlier and extending for some distance backwards. 



General Colour — Red. 



Development of Gonosome observed in June and July. 

 Habitat. — On Fucus vesiculosus. 

 Batli^metrical distribution — Literal zone. 



Locality. — Massachusetts Bay, Professor Agassiz ; jMorecambe Bay, Lancashire, Mr. West 

 (teste T. Hincks). 



The Clava leplostyla of Agassiz is so closely allied to the European Clava squamata that its 

 recognition as a separate species is by no means obvious. Its distinguishing characters would 

 seem to lie in its greater number of tentacles, and especially in the more cylindrical form of its 

 hydranths, which thus contrast with the more fusiform hydranths of Clava squamata. Mr. 

 Hincks believes that he has identified with it specimens of a Clava obtained from Morecambe Bay, 

 and on the strength of this identification I have retained it among British species. I have never 

 seen it, and the diagnosis given above is compiled from characters selected from the description 

 published by Agassiz. 



5. Cl.4.va nodosa, Slrelhill Wright. 



Clava nodosa, — Wriyht. In Proc. Eoy. Phys. Soc. Ediiib., for 18G2. 



TROPHOSOME. — Hydrouhiza in the form of delicate threads, which "at intervals 

 twine themselves into a convoluted knot of membranous tubes, from which a single 

 polyp arises." — Wright. 



GONOSOME.— ? 



Colour. — •" Aurora red." 



Habitat. — On the fronds of DeJesseria sanyuinea. 

 Locality.— Y\x\\\ of Forth, Dr. Wright. 

 Bathymetrical distribution. — Laminarian zone. 



I have never met with this hydroid, and all I know of it is from Dr. Wright's short 

 description. The knotted condition of the hydrorhizal tubes is certainly very peculiar. A fuller 

 description of the entire hydroid, however, is much to be desired, more especially as no figure 

 accompanies the published account of it. 



