10 SYDNEY J. HICKSON. 
Winter Quarters locality is 220 mm. The diameter of the colony is in all specimens 
about 30 mm. 
The calices are about 1°5 mm. in height. They are clustered together at the 
ends, but scattered at considerable intervals near the base of the branches. There 
are a few calices on the main axis itself. The spicules are overlapping scales, oval 
or heart-shaped on the general ccenenchym and on the base of the calices. 
Diameters of these scales, taken at right angles, are about 0°43 mm. x 0°4 mm. 
The scales forming the operculum of the calyx have a thick, keeled spine, the 
sharp, saw-like keel being on the oval side of the scale and extending from the 
tip of the spine to the centre of the plate (fig. 19). The length of the spine is 
about 0*4 mm., and the distance from the tip of the spine to the opposite border 
of the plate 0°64 mm. The breadth of the plate is 0°43 mm. 
The type of this species was found by Captain Thouars off the Falkland Islands. 
The species was also obtained by the ‘ Challenger’ near the Crozets in 550 fathoms. 
A good account of the genus and of the species belonging to it is given by Dr. Versluys 
(13). The species was only figured by Valenciennes (12), but was subsequently 
described by Professors Wright and Studer (14) from specimens obtained by the 
‘ Challenger.’ 
I have compared the specimens with an example of Thouarella brucii, kindly lent 
to me by Prof. J. A. Thomson, and I am able to confirm the distinction of the species. 
The scales are larger in 7. antarctica, and the spines of the coronal scales longer and 
sharper than in 7. brucei. 
PRIMNOELLA DIVERGENS. 
KE. end of Barrier, January 29, 1902. 100 fathoms. 
(Plate L, figs. 8, 9 & 10.) 
The single-specimen of this extremely interesting species is 135 mm. in height, 
but the base of attachment is lost, and the thickest part of the horny axis is 
2mm. in diameter. In the first notes I made I placed it in the genus Primnoella, 
but on reconsideration and further study I transferred it to the genus Caligorgia, and 
gave it the name C. sguamata. Taking advantage of a visit to my laboratory by 
Dr. Versluys of Amsterdam, whose great work on the Primnoide of’ the Siboga 
expedition (18) has just appeared, I asked him to examine the specimen, with the 
result that it is returned to the genus Primnoella with the name P. divergens. 
This hesitancy in determining the generic position of the specimen was due to the 
fact that it occupies a position in the system almost exactly intermediate between 
these two genera. It is either a very divergent Primnoella, or else a very divergent 
Caligorgia. It is perhaps a matter of opinion whether it is most nearly related to 
the former or to the latter genus. Dr. Versluys pointed out certain characters which 
I had overlooked, and converted me to the view that it should be placed in the 
genus Primnoella ; but it exhibits so many characters of Caligorgia, which I shall relate 
