854 THOMSON AND RITCHIE ON THE ALCYONARIANS 
branches in at least three directions, by the origin of twigs on all sides of the axis, by 
the cylindrical shape of the axis, and by the detailed speculation of the polyps. 
Localities.—Burdwood Bank, 56 fathoms, December 1, 1903; Gough Island, 100 
fathoms, April 22, 1904; St Helena. 
Amphilaphis regulams, Wright and Studer, Pl. II. fig. 5. 
Numerous fine specimens of this graceful form were obtained from St Helena. The 
following measurements of height and lateral expansion were taken in cm. :—40 by 25, 
33 by 15, 26 by.15, 20 by 30, 17 by 9, 20 by 19, 20 by 10,16 by 11; but none of 
these represent complete specimens. As is the case with Thouarella brucei, there are 
very noticeable differences in the vigour of the various specimens, for some have the 
polyps much more crowded than others. 
The specimens agree closely with the description by Wricur and Sruper, but it 
may be noted that the figures of the spicules given in the Challenger Report do not 
show the prominent spines described in the text. We have therefore given a 
supplementary figure. 
We add a few details in reference to the spicules. The scales of the operculum 
are roughly triangular, usually with an indentation in the base directly opposite the 
nucleus. A strong ridge, sometimes double, extends from the apex of the triangle 
towards the nucleus, which, however, it seldom reaches. The calyx scales resemble a 
rude ellipse, toward the upper edge of which the tubercles have become fused to form 
prominent ridges, frequently 0°08 to 0°1 mm. in length, radiating from the nucleus and 
projecting as spines beyond the edge. The arrangement of the ridges resembles that of 
the teeth in a comb. 
The specimens bear numerous small Actinians, clusters of Polyzoa, clambering 
Ophiuroids, serpuloid worm-tubes, small barnacles, ete. 
J ocality.—St Helena. } 
Primnoella scotiz, n. sp., Pl. I. figs. 3 and 8. 
A simple upright colony, 105 mm. in height, of a dirty yellowish-white colour. 
The basal portion is absent and the axis has disappeared. It looks as if the dredge had 
dragged the colony from off the axis, for there is a slightly oval central canal, a little 
over 1 mm. in diameter at the base and narrowing to 0°5 mm. towards the apex. 
The stem is closely covered with polyps arranged in whorls of 9 to 11, the most 
frequent number being ten. The calices are closely apposed to the stem and are 
pressed against one another laterally, and the whorls themselves overlap, so that the 
general effect is that of a uniformly thick rod with a diameter of 4 mm. 
The calices are from 2°5 to 3 mm. long and 1 mm. broad, but owing to the over- 
lapping at the base less than 2 mm. of the calyx is visible. Under the lens the 
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