60 Prof. AUman on the Hydroida. 



beautiful Harbour of GlengariflF, tbis very distinct hydroid was 

 obtained. 



Tubularia humilis, AUman, n. sp. 



TVojoAosome.— Hydrocaulus attaining the height of about one 

 inch, simple or sparingly branched, the main stems springing 

 at distinct intervals from the creeping ramified stolon ; periderm 

 with nearly obsolete transverse corrugations : polypites supported 

 on collar-like expansions of the coenosarc, they measure in full- 

 sized specimens about two lines from tip to tip of the extended 

 proximal tentacles, and have about twenty proximal and fifteen 

 distal tentacles ; body of polypites scarlet, periderm light yellow. 



Gonosome. — Gonophores (male*) borne on very short branch- 

 ing peduncles, forming erect clusters of scarlet sporosacs, usually 

 about three in each cluster ; summit of gonophore with three 

 rather large tentaculiform tubercles. 



I obtained T. humilis during the autumn, attached to the 

 rocks close to the level of low-water spring tides near the mouth 

 of Kinsale Harbour. It resembles T. bellis in its mode of growth 

 and in the shortness of its hydrocaulus ; but is at once distin- 

 guished from this species by the absence of distinct annulation, 

 and by the smaller size and less-appressed form of the polypite. 



Tubularia attenuata, Allman, n. sp. 



Trophosome. — Hydrocaulus attaining the height of three or 

 four inches, slender, obscurely corrugated, very irregularly 

 branched, with the branches given oflf at a wide angle : polypite 

 supported on a collar-like expansion of the coenosarc; distal 

 tentacles about one-third as long as the proximal ones ; body of 

 polypite deep vermilion between the two tentacular verticils, and 

 thence becoming paler coloured towards the enlarged base, peri- 

 derm light straw-colour. 



Gonosome. — Gonophores (malef) borne on short erect 

 branched peduncles, with usually five to eight in a cluster ; ten- 

 tacuhform appendages of gonophores long, in mature individuals 

 nearly equalling in length half the height of the gonophore. 



T. attenuata is a deep-water species ; I have dredged it from 

 about 15 fathoms in the Firth of Forth, and from about 50 

 in the Shetland seas. It difi'ers from T. coronata chiefly in its 

 more difiuse habit and the short erect peduncles of its clusters 

 of gonophores, while from the T. simplex, Alder, it is easily 

 distinguished by its branched hydrocaulus and by the greater 

 length of its distal tentacles. 



* All the specimens examined were males, 

 t Only male specimens have been examined. 



