no. 1624. DESCRIPTIONS OF HAWAITAN ALCYONARIA—NUTTING. 575 
STENELLA HELMINTHOPHORA, new species. 
Plate XLIV, figs. 6-9; plate XLVII, fig. 5. 
Specimens much broken up. Colony evidently large, one stem being 
13 mm. in diameter and densely calcareous. Branching not easily 
made out owing to the greatly broken condition of the specimens. 
Main branches irregularly distributed, branchlets dichotomously di- 
vided, with a tendency for the twigs to lie in the same plane. 
Polyps irregularly distributed on. main stem and branches, and in 
irregular whorls of four on the terminal twigs, length about 4 mm., 
shape cylindrical with a greatly expanded distal end, which flares 
lke the mouth of a trumpet. The calyces project rigidly from the 
stem at right angles. 
Spicules very large and squamiform, concave on cortex, with con- 
vexity resting on stem or branch, less concave on calyx where the 
scales are in about four whorls with three or four to a whorl. First 
whorl! longest, often consisting of but two scales; third whorl shortest ; 
the first, second, and third whorls forming a cylinder, but with their 
distal edges often elevated and more or less frilled. The distal whorl 
is much expanded at its margin, forming a cup composed of four 
scales (two larger and two smaller) inclosing the operculum. The 
operculum is composed of eight scales, each of which has a lamelli- 
form raised edge, giving the appearance of eight vertical concentric 
plates. The operculum extends considerably beyond the calyx wall. 
The spicules of the cortex are scale-like, fluted, often convex, with 
the convexity attached to the stem or branch. 
Nearly all of the specimens were infested with an annelid, which 
had, by its presence, modified the first whorl of body scales so that 
they formed a sort of a tunnel, running along the branches, in which 
the annelid lved. These modified scales are enormously enlarged, 
two rows of them arching over and meeting each other above, form- 
ing an arcade. These arcades cover the greater part of one side of 
the branches in many specimens, and it is scarcely to be wondered at 
that Wright and Studer took this arcade or tunnel to be a normal 
structure.? 
In several specimens small simple-armed basket fish were exces- 
sively numerous, and these, too, seemed to have modified in some de- 
gree the cortex scales. 
This species differs from Stenella spinosa in color of stem, and in 
having much more slender polyps; and from S. johnstoni in the 
number of whorls of spicules, and in the operculum. 
“Report on the Aleyonaria collected by H. M. S. Challenger during the years 
1873-1876, p. 53. Here the authors regard this structure as a generic character 
of the genus Calypterinus, an error that has already been corrected by Studer. 
(See Aleyonaires provenant des campagnes de l’Hirondelle, 1886-1888, 1901, 
p. 40.) 
