IS 5 
C. alciformis is marked by points of io—15 spicules, tending to chevron, but more irregular 
than in the other species, and by 10—14 rows of horizontals ; 
C. lampas is marked by points of about 3 pairs of chevroned spicules and by about six rows 
of horizontals; 
C. simpsoni is marked by well-defined points which may consist [a] of two dominant pairs of 
chevroned spindles, plus three laterals on each side, and often an included pair at the base 
of the chevron triangle, or ( b ) of 3 — -5 pairs of more irregularly chevroned less massive 
spindles; and by up to about 15 rows of horizontals. 
Family Fasciculariidae. 
Genus Paralcyonium. 
1. Paralcyonmm elegans Milne-Edwards. (Plate XIII, Fig. 5). 
MlLNE-EDWARDS, Memoire sur un nouveau genre de la famille des Alcyoniens. Ann. Sci. 
Nat. 2 Ser. IV, 1835, p. 323, 9 figs. 
VON KOCH, Alcyonacea des Golfes von Neapel, Mt. Zool. Station Neapel, IX, 1890, p. 672, 1 fig. 
Stat. 164. i°42 / .5 S., i30°47 / .5 E. 32 M. Sand, small stones and shells. 1 Ex. 
An interesting small specimen from Station 164 consists of a stout basal trunk, with its 
walls thickly filled with longitudinally placed spicules, and above this a branched polyparium 
partially contracted within the basal trunk, which thus acts as a kind of investing involucre. 
The total height of the colony is 1.8 cm., of which 1.1 cm. consists of the involucre. This has 
a maximum diameter of 7.5 mm. The polyparium is so much contracted that one cannot 
distinguish the precise mode of branching; only the uppermost twigs are clear, with the pedi¬ 
cellate polyps arising irregularly on them. The maximum length of a polyp in our specimen 
is about 3 mm. with a breadth of 1.4 mm. The walls of the polyps and branches are very 
thin and transparent, so that the stomodaeum and mesenteries are clearly visible within. 
Spiculation is entirely wanting in many of the polyps, but a note stating that the 
preservative was 4°/ 0 Formalin may help to account for this. The spiculation is seen however 
on some of the polyps contracted within the involucre. On the walls of the polyp it consists 
of spindles, in some irregularly disposed, in others arranged longitudinally or sloping on the 
dorsal surface near the base of the- polyp, so that the dorsal surface shows a definite armature. 
Above this, below the base of the tentacles, are 8 points of very delicate small spindles 
arranged in chevron, up to about 6 pairs in a point (average dimensions 0.42 X 0.04 mm.). 
On the dorsal surface of the tentacles there are irregularly sloping crowded "rows of minute 
stout rods (about 0.14X0.02 mm.). 
The twisted, minutely warted spindles of the involucre attain a maximum length of 
3.5 mm. and have an average breadth of o. 1 mm. All are covered with extremely minute 
simple prominences. 
The colour of the calyx is white owing to the dense armature of colourless spicules. The 
polyparium is a semi-transparent greyish brown. 
SIBOGA-EXPEDITIE XIII d. 24 
