410 TUBULARIA ATTENUATA. 



7. TuBULARIA ATTENUATA, Allman. 



Plate XXII, figs. 1 and 2. 



TuBULARiA ATTENUATA, — Alhnan, iu Aun. Nat. Hist, for July, 1864. Hincks, Brit. Hydr. 



Zooph., p. 122. 



TROPHOSOME. — Htdrocaulus attaining a height of three or four inches, 

 slender, ohscurely corrugated, very irregularly branched, with the branches given off 

 at a veide angle. Htdeanth supported on an annular expansion of the ccenosarc, 

 and with the tentacles of the proximal circlet about three times as long as those of 

 the distal one. 



GONOSOME. — GoNOPiiORES (male)^ borne on short erect branched peduncles, 

 with usually five to eight in a cluster, and with four conical tentaculiform processes, 

 which equal in length nearly half that of the mature gonophore. 



Colour. — Body of hydranth deep vermilion between the two tentacular verticils, paler in the 

 enlarged base ; coeiiosarc pale pink, with light straw-coloured perisarc ; spadix vermilion. 

 Development of Gonosome. — June. 

 Habitat. — Attached to old shells and stones in the sea. 

 Batliymetrical distribution. — Deeper pai'ts of Coralline zone. 

 Localities. — Shetland Islands and Firth of Forth, G. J. A. 



Tubularia attenuata is a deep-water species. I have dredged it from about fifteen fathoms in 

 the Firth of Forth, and from about fifty fathoms in the seas round the Shetland Islands. It has 

 a diffuse and somewhat straggling habit. Its nearest congener would appear to be the Tubularia 

 simplew of Alder, from which, however, it differs by its branched hydrocanlus, and apparently, 

 also, by the greater length of its distal tentacles. 



' I have had no opportunity of examining female specimens. 



