148 PEKCY SLADEN TEUST EXPEDITION. 



Many of the polyps contained reproductive bodies with cavities, which will he 

 discussed in a separate paper. The colour of the colony is greyish-brown with a 

 distinct rose tinge. 



This species is closely allied to C. investigatoris, from which it can be distinguished 

 by its stouter growth, its thicker coenencbyma, its shorter cylindrical verrucse (as 

 conti-asted with the conical verrucae of C. investigatoris), and the much greater size of 

 the spicules of its coenenchyma. The other species, C. ruhrotincta, is much more delicate. 



Locality. Salomon, 60-120 fathoms. 



A large brown colony was dredged at Salomon in 75 fathoms. A dried specimen 

 reaches a length of 33 cm. and a breadth of 12 cm. 



16. Calicogorgia rohusta, var. rosea, n. (Plate 8. figs. 7 & 8.) 



A very distinct colour-variety of C. robusta was dredged at Providence. It is of a 

 deep rose-red colour, with yellow projecting polyjis. The specimen obtained is not 

 complete. It consists of a main stem 125 mm. in length, which gives off two lateral 

 branches. The stem is 5 mm. thick ; the verrucse reach a length of 3-5 mm., and the 

 polyp-heads project 1 mm. beyond the verrucse. Altogether it is a thicker and larger 

 form than the typical C. robusta. 



The spicules are very similar to those of the type in size and shape, but the large 

 spicules do not show intei'locking outgrowths. The spicules are mostly rose-red, but 

 there are a few small colourless spindles, probably polyp-spicules. 



Loculity. Providence (D 11), 50 fms. 



17. Calicogorgia rigida, sp. n. (Plate 8. fig. 5.) 



An incomplete colony, consisting of a much bent main stem, which rises to a height 

 of 14 cm., and gives off four broken branches. The general colour is vivid orange; the 

 anthocodise are dirty white. The surface appears very rough to the naked eye. 



The verrucse are crowded all round the stem ; they are truncated cones with vertical 

 spindles in their walls ; they are about 1-5 mm. in breadth and rise to a height of 

 1-5-2 mm. ; the anthocodiae may project for another millimetre. The spicules of the 

 verrucse are somewhat stronger than those of the coenenchyma, and there are about 

 sixteen of them projecting around the margin. 



The operculum consists of a crown of three or four rows of transparent spindles, and 

 triangular points of three or four converging pairs of similar spicules. There are also 

 small spicules on the aboral surface of the inturned tentacles. 



The axis is exceedinglj'^ hard and calcareous ; it has a diameter of about 4 mm. at the 

 base and about half that at the upper (broken) end of one of the branches. 



The coenenchyma sjiicules are densely-warted spindles with tubercles on the warts. 

 The general colour is orange-yellow. The following measurements were taken of length 

 and breadth in millimetres : — 



(a) Large spindles : 091 X 0-3, 0-79 X 017. 



(6) Intermediate spindles : 0-66 X 0-26, 0-61 X 0-14. 



(c) Small spindles : 0-30x008, 0-26 X0'07. 



