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12. Siphonogorgia gracilis (== Chironephthya gracilis Harrison, 1908). 
(1) Crown — 5 rows of spicules. 
Points — 3—5 spicules en chevron, larger than those of the crown and with more 
pronounced warts. 
(2) Not described. 
(3) Anthocodise unretracted. 
(4, 5) Not described., 
(6) Branches short and slender. Polyps sessile and single on main stem branches, in groups 
and generally on short stalks on terminal twigs. 
Colour — stem and branches deep red, polyps orange yellow. 
Locality: Admiralty Islands. 
13. Siphonogorgia harrisoni Thomson and Russell, 1910. 
(1) Crown — 6 rows of spicules. 
Points — 3—4 convergent pairs of spicules. 
(2) Verrucae distinctly spirally arranged, from 2 — 3 mm. apart. 
(3) Anthocodise retractile. 
(4) Strong development of spicules in canal walls gives the stem a compact resistant character. 
(5) Pale yellow-brown spindles, with prominent tuberculate warts. 
(6) Branches terminate bluntly. Swollen appearance of the tip, due to the crowding together of 
5 or 6 polyps. Stem perfectly cylindrical, branches compressed and deeply furrowed. 
Locality : Providence. 
14. Siphonogorgia hicksoni Thomson and Russell, 1910. 
(1) Crown — at least 10 rows of spicules. 
Points — 3—4 short red spicules, lying more or less parallel. Occasionally one spicule may 
dominate or two may converge. One or two smaller spicules between these main groups. 
The tentacle spicules are very conspicuous, being a bright lemon-yellow colour, while the 
other polyp spicules are dull maroon-red. 
(2) Verrucae arranged in wide spirals, ending in 3—4 at the tip of the branch, more strongly 
developed on the side away from the branch, so that the polyps face directly upwards. 
Outer spicules frequently project beyond the polyp base as a distinct point. 
(3) Anthocodiae unretracted. 
(4) Not described. 
(5) Long, slender, crimson-red spicules, with comparatively simple warts. 
(6) Stem, at first cylindrical, becomes broad, flattened and furrowed where the branches begin. 
Branches often pendulous at the tips. Polyps only on the branches. 
Locality : Providence. 
Note. This species is near S. mirabilis and S', miniacea. 
