Dr Fleming the British Testaceous Annelides. 
with finer fibres. When the animal withdrew its ientacula, it became 
somewhat convoluted as the fibres closed, and turned a little spiral up 
the stalk : their colour pale yellow, or yellowish-Avhite, the fibres or 
pimuB annulated with pink, so as to form regular semicircular lines when 
the plumes were spread.” 
In Cordiner’s work, already quoted, there is an indication of another spe- 
cies, probably belonging to this genus, from the Murray Frith, which 
deserves to be noticed, and may be termed 
2. S. Cordineri — Shell triangular, branchiae stellular, lid produced, with an 
obtuse termination, and five lobes on each side, opposite, in pairs. Cor. Ruins, 
No. 2. Terebellae. Adhering to a stone dredged up in forty fathoms water. 
In the same work. No. 22. plate “ Peacock’s-feather Coralline,” a represen- 
tation is given of a Serpula with the margin of the- mouth deeply notch- 
ed, and the surface of the shell furnished with longitudinal denticulated 
ridges. This species, which may be termed muricata, was probably 
brought from the coast of Norway, but has been here mentioned as one 
likely to occur as a northern Scottish production. 
B. — Shell regular, discoid and spiral. 
The shells of this division seldom exceed an eighth of an inch in 
the diameter of their outline. The side by which they adhere 
is, in general, far too tender to admit of being detached, entire, 
from the body to which it adheres. The young of the sulcated 
kinds are nearly smooth. 
Genus SPIRO RBIS. — Shell with the spires dextral. Animal fur- 
nished at the neck with radiated, pinnated branchiae, and a pe- 
dunculate, clavate, or funnel-shaped lid. The number of the 
branchiae, and character of the lid, vary according to the spe- 
cies, and merit an attentive examination. 
I. — Recent Species* 
a. Shell with longitudinal ridges. The last formed whorl only visible. 
Aperture circular. 
Species 1. S. granulatus — Shell with three ridges and two grooves. Ser- 
pula gr. Linn. Syst. 1266 Serpula sulcata, Adams, Linn. Trans, iii. 255 — 
Serpula gran. Don. Br. Sh. tab. c — Montagu, Test. Brit. p. 500. On old shells, 
but more frequently on the under side of loose stones about low water-mark, 
very common. 
The shell consists of two whorls, with a distinct central cavity. The base 
of the shell is narrow, and the sides are nearly vertical. The three ridges 
which occupy the upper surface are rounded. The outer one is margi- 
nal, and of the same size as the inner one, which is also marginal, in re- 
ference to the central cavity ; the middle one is the largest. The two 
grooves are rounded. There are a few irregular, transverse wrinkles. 
Colour dull white. The animal, according to Montagu, is furnished 
with ten ciliated branchiae. Lid lateral, subfunnel-shaped, with a brown, 
ciliated, hyaline margin. The rest of the body is of a buff colour. 
2. .S', carinatus Shell flat, with a single naarginal ridge. Serpula car. 
Mont. Test. Brit. p. 502 — Spir. car. Flem. Edin. Ency. vii. p. 68. tab. cciv. 
fig. 13. Adheres to old shells. Devonshire and Zetland. 
The shell consists of two whorls, with a narrow base, and nearly vertical 
sides. The upper surface is almost flat, or slightly concave, with a cen- 
tral cavity surrounded by a sharp, rather elevated margin. The outer 
margin is nearly rectangular, with a sharp ridge. The surface is trans- 
