CLAVA SQUAMATA. 243 



The first to restore the name of Clava to its legitimate phice, after its long banishment from 

 the nomenclature of the IIydroiua, was Johnston, who has thus not only performed an act 

 of justice to the memory of Gmelin, but has removed no slight element of confusion from the 

 classification of the HvDRomA. 



1, Clava squamata, 0. F. Milller. 

 Plate I. 



ZoOPHYTON MINUTUM CoRYN^ SIMILLIMUM, Pcillas, Spicil., fasc. X, p. 36, pi. Iv, fig. 9. 



Hydra squamata, — Otho Fred. Mliller, Zool. Dan. Prod., 278G. Zool. Dan. Icon., tab. iv. 



Otho Fabricius, Fauna Groenlandica, p. 347. 

 CoRYNE SQUAMATA, — Lamarck, An. s. vert., 1816, II, 63. Sleenstrup, Hermaphr. i Nat., 



pi. i, figs. 17 — 31. 

 CoRYNA MULTicoRNis, — Ehrcnberg, Corallenthiere, Abliandl. Berl. Akad., 1832, p. 293. 

 Clava multicornis [in part], — Johnston, Brit. Zooph., 1847, p. 30. 

 Clava membranacea, — Strethill Wright, Proc. Roy. Phys. Soc. Ediub., vol. i, p. 228, 



pi. X, figs. 2 and 3. 

 Clava cornea, — Strethill Wright, Proc. Roy. Phys. Soc. Edinb., vol. i, p. 228, pi. xi, fig. 4. 

 Clava squamata, — Hincks, Brit. Hydr. Zooph., p. 4, pi. i, fig. 2. 



TROPHOSOME. — Hydrocaulus, about one twentieth of an inch in height, consist- 

 ing of minute, simple, closely aggregated, tubular offsets from the surface of the hydro- 

 rhiza. Htdeorhiza formed of closely approximated inosculating tubes, united to one 

 another along their sides by an extension of their perisarc, so as to form a continuous 

 basal expansion. Htdranths very much elongated, somewhat fusiform between the 

 rudimental hydrocaulus and the club-shaped head, when fully extended attaining a 

 height of about one inch, closely approximated at tlieir base, so as to form a tassel- 

 like cluster ; tentacles about twenty. 



GONOSOME. — GoNOPiioRES in clusters springing from the body of the hydranth 

 immediately behind the proximal tentacles, each cluster carried upon a very short 

 peduncle. 



Colour. — A clear yellowish-red, with pale hyaline tentacles. 



Develojiment of Gonosome. — April to September. 



Habitat. — On Fuci, especially Fitciis serratus, Fucus vesiculosus, and F/fcus nodovus, on timber- 

 piles, &c., in estuaries and sheltered bays. 



Bathymetrical dislrihution. — Literal zone. 



Localities. — Shores of Denmark and Norway, 0. F. Miiller ; coast of Greenland, Otho 

 Fabricius ; sea-coast near Norwich, Pallas. Generally distributed round the shores — especially 

 the more northern ones — of the British Isles. 



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