THOMSON AND RUSSELL — AXIFERA. 



147 



The spicules are all straight or curved sj)indles with numerous small close-set tuber- 

 culate warts. They are orange-yellow in colour, the smaller (polyp) spicules being 

 lighter in colour. The following measurements were taken of length and breadth in 

 millimetres:— 0-82 X012, 0-91x0-16, 1-4 X 0-23, 0-56 X 0-07, O'Sl X 0-035. 



Localities. («) Amiraute (E 15), 39 fms. ; [b) Providence (D 4), 50-78 fms. 



Genus CALICOGORGIA. 



There is no doubt that Calicogorgia and Anthogorgia are closely allied genera. 



In the Calicogorgia type thei'e is a more or less prominent anthocodial region, 

 supported by a crown and points. Bent inwai-ds from the tips of the points, the 

 tentacles are recurved like tish-hooks, and the proximal half of the tentacles bears a 

 double row of spindles on its aboral surface. 



In the Anthogorgia type there is no anthocodial operculum, but the upper margin of 

 the verruca forms eight triangular points. Internal to this lie the small spicules on the 

 aboral surface of the tentacles. 



15. Calicogorgia robusta, sp. n. (Plate 7. figs. 8 & 9.) 



A strong colony, branched somewhat irregularly, but appi'oximately in one plane, 

 rising to a height of about 25 cm. with a maximum breadth of about 9 cm. The axis 

 is about 4 mm. in breadth at the base, and dwindles gradually to about 1 mm. The 

 cylindrical polyps are for the most part arranged in a single series along each side of the 

 branches and twigs, standing out almost at right angles to a height of 2-3 mm., with a 

 breadth of 2-2-5 mm. On one side of the colony there are some polyps away from the 

 sides and towards the middle line of the branches. 



The verrucge are covered with large rough spindles more or less longitudinally disposed, 

 and show eight marginal points, each teruiinating in a single spicule. The arrangement 

 in eight vertical double rows, seen in at least some of the verructe of C. investigator is, 

 Thomson and Henderson, is not demonstrable here. 



The M'ell- developed operculum, which may protrude beyond or be retracted within 

 the verruca, consists of a crown and points. The tongue-shaped points include four or 

 more spicules and the horizontal spicules of the crown are two or three deep. 



The tentacles are incurved like fish-hooks, and two or three rows of longitudinally 

 disposed curved spindles are seen on the aboral surface of their proximal parts. 



The spindles are stout, warty spindles, of very various sizes ; many of them show a strong 

 development of interlocking outgrowths, and in some cases these are all developed on 

 one side. Most of the larger spindles are curved. Many of the smaller spindles are 

 pinkish in colour, and straight. 



The following measurements were taken of length and breadth in millimetres : — 



{a) Larger spicules : 1- 5x028, 1-75x0-32, TSSX 0-35. 

 (6) Smaller spindles : 0-28x0-05,0-38x007. 



SECOND SEEIES. — ZOOLOGY, VOL. XIII. 



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