150 Prof. M‘Intosh’s Notes from the 
which are pale greenish yellow, and the anterior region of a 
fine reddish hue which tints the cephalic region at the base 
of the branchiz and passes a short distance along each 
filament. When eggs are present the posterior region is 
also reddish, the colour of these being of a brighter hue 
than the front. Two dark eyes occur on the dorsum of the 
reddish cephalic area. The anterior (thoracic) membrane is 
more deeply tinted in front than behind. When in full 
vigour the pure white of the calcareous tubes, the scarlet of 
the anterior region which just projects beyond them, and 
the pale greenish-yellow fans with their opaque tips make 
a picture at once beautiful and characteristic. The filaments 
of the branchie, when fresh, show under a low power a 
distinct moniliform arrangement of granular dots in all the 
British forms along each side—indicating a less developed 
stage of the more highly organized condition in the Mediter- 
ranean form—Salmacina edijicairiz. These granular masses 
are situated on the outer aspect of the interpinnate spaces, 
and are prominent in a face or a lateral view. The tips of 
the branchiz are in all more or less cylindrical, and under 
a lens present a whitish opacity. The expanded branchial 
fan is even more beautiful than that of Aleyonium from the 
larger size and greater richness of the filaments and pinne. 
The separate filaments are often curved toward the mouth, 
ay proximated, expanded or drooped on one side, the move- 
ments in the absence of irritation generally being slow. 
W hen touched with a needle, however, the entire fan shrinks 
into the tube, and though it by-and-by unfolds it may 
sharply retract several times spontaneously as if in remem- 
brance of the contact of the foreign body. The collar is 
often folded backward over the tip of the tube when the 
branchial fan is expanded. A separate branchia retains 
vitality for a considerable time and the pinne move as in 
the perfect fan, the tip of the filament also bending inward 
as if carrying out its usual functions, the whole occasionally 
rolling together like a ball and again expanding. The 
funnel-like aperture leading to the mouth is richly ciliated, 
and so with the anal groove posteriorly. Cilia also occur at 
the bases of the feet. 
On arrival at St. Andrews those from Plymouth expanded 
their branchial plumes freely, and after the first two days 
various examples dropped from their tubcs to the bottom of 
the vessels, and this continued during several weeks. The 
extruded forms quietly expanded their branchiz on the 
bottom of the vessels, the filaments bending inward now 
and then and again being expanded, whilst those with long 
ee a 
