OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 855 
verrucee appear as slightly flattened cylinders covered with fine horizontal striz, which 
higher magnification shows to be the smooth edges of regularly arranged broad 
imbricating scales. These are arranged in two longitudinal parallel rows along the 
dorsal surface, those in one row interlocking with the alternate scales of the other row. 
The upper edges of all the dorsal scales are parallel, and the two rows meet in the 
middle without any distinct angle or keel. Hach row has from 21 to 28 scales. 
On the ventral side of the calyx there are two small longitudinal rows along the 
edges, but the rest of the surface is covered with indistinct roundish scales irregularly 
disposed. 
There does not seem to be any special operculum, but several of the uppermost 
scales bend over so as partly to cover the mouth of the calyx, within which the 
retracted tentacles of the polyp can usually be seen. 
The dorsal calyx-scales are roughly rectangular, very broad and slightly curved to 
fit the cylindrical polyp body. ‘The upper or projecting margin of each scale is smooth, 
while the lower or overlapped margin is toothed. The whole of the inside of the scale, 
except a narrow strip along the upper edge, is covered with numerous small tubercles. 
On the external surface there are numerous very fine wavy lines running from edge to 
edge of the scale. | 
The other scales are irregular in outline, sometimes with toothed margins, sometimes 
smooth-edged ; they may be almost free from tubercles or covered with them. 
All the scales are colourless, and show an eccentric darker nucleus from which any 
slight ridges on the surface run. From these nuclei, as is shown by polarised light, the 
rest of the scale has been deposited in concentric zones. 
Locality.—Burdwood Bank, lat. 54° 25’ S., long. 57° 32’ W.; 52 fathoms. Surface 
temperature 41°8°, December 1, 1903. 
Primnoella magellanica, Studer, Pl. I. fig. 3. 
An almost complete specimen of this species, lacking only a small part of the basal 
region. The stem reaches a height of 148 mm., but towards the lower end the 
coenenchyma has disappeared, exposing the brown axis for about 15 mm., while for the 
next 30 mm. the whorls of polyps are broken and incomplete. 
The specimen agrees with the description of P. magellanica given in the Challenger 
Report except in the following particulars. In the Challenger specimen the number 
of polyps in a whorl was 8; in the Scotia specimen there are 9, 11, 12, 18, 10, 12, 
12, 13, in the various whorls counted. In the Challenger specimen the opercular 
scales were in length and breadth 0°48 x 0°2 mm., while the corresponding measurements 
for the Scotia specimen are 0°65 x 0°35, 0°625 x 0°375 mm. Similarly for the calyx 
scales, the measurements for the Challenger specimen were 0°31 x 0°3, 0°36 x 0°37; 
and for the Scotia specimen 0°3x0°3, 0°425x 0°35, 0°3x0'25. Thus there are 
decidedly larger dimensions in the scales of the Scotia specimen. The larger and 
