246 CLAVA MULTICORNIS. 



Clava squaiiiata loves tlie more sheltered bays and estuaries of our coast ; and I have never 

 found it in situations exposed to the surf of the open sea. It is not uncommon in the more shel- 

 tered parts of Dublin Bay, and is abundant in most of the fiord-like inlets of the sea which 

 characterise the western shores of Scotland. It occurs also in abundance on the shores and rocky 

 islands of the upper parts of the Firth of Forth, where I have met with it in great perfection about 

 forty miles from the open sea, at Craigflower, the seat of Sir J. Colvile, a point where the fresh 

 waters of the river have not yet ceased to exert their influence on the life of the estuary. 



It is a hardy species, and may be kept alive for many weeks in our aquaria. 



2. Clava multicoenis, Forshal. 

 Plate II, figs. 1, 2. 



Hydra multicornis, — Forskal, Descript. Animal., 1775, p. 131, and Icones, tab. .xxvi, fig. B b. 



CoRYNE MULTICORNIS, — Lumarck, An. s. Vert., 1816, vol. ii, p. 62. 



CoRYNE SQUAMATA, — Van Benecleu, Mem. siir les Tubulaires, p. 60, pi. v. 



Clava multicornis, — Johnston [in part], Brit. Zooph., 1847 (pi. i, figs. 1, 2)? Leidy, 

 Marine Invert. Fauna of Rhode Island and jS^evv Jersey, p. 3, pi. xi, 

 figs. 33, 34.1 Hhicks, Brit. Hydr. Zoopli., p. 2, pi. i, fig. 1. 



Clava repens, — Wright, Proc. Roy. Phys. See. Edinb., 1857. 



Clava discreta, — Alhnan, Ann. Nat. Hist., 1859. 



TROPHOSOME. — Htduocaulus consisting of minute tubes, about l-20th of au 

 inch in heiglit, distributed at distinct intervals over the hydrorhiza. Htdrorhiza 

 consisting of a ramified, tubular, creeping filament, wliose branches are not adherent 

 to one another. Htdraxths about a quarter of an inch in height, not clustered ; 

 tentacles in well-grown specimens, twenty or more. 



GONOSOME. — ^GoNOPHORES forming very shortly pedunculated, almost sessile 

 clusters, wliich are aggregated on the body of the liydranth, immediately behind the 

 proximal tentacles. 



Colour of hydranth and gonophores varying from very pale brown to light red. 



Development of Gonosome. — April to September. 



Habitat. — Creeping over stones, sea-weeds, &c., near low-water mark. 



Bathymetrical distribution. — Laminarian zone and lower limit of Litoral zone. 



Localities. — Coast of Denmark, Forskrd ; New Jersey, Leidy ; Firth of Forth, Dr. Wright ; 

 Firth of Forth, Firth of Clyde, Orkney and Shetland Islands, and various other parts of the 

 British Isles, G. J. A. 



' Leidy's Clava multicornis is regarded by Agassiz as identical with his own Clava leptostyla. I 

 can see nothing, however, in Leidy's figure or description to distinguish it from the Clava multicornis 

 of Forskal. 



