Dr Fleming on the British Testaceous Annelides. 
Recent. 
Dentaliura denlalis, No. 1 . 
octangulatiim, 2. 
-eiitalis,.. 3. 
Gadus, 4. 
The species, Dentalium imperforatum, trachea and glabrum of Montagu, 
which constitute my genus Csecalium, have recently been investigated 
with care by an acute observer, and he has arrived at the conclusion that 
they are portions merely of multilocular shells. 
II. 
Testaceous Annelides with the shell permanently attached to other 
bodies, closed at the retral extremity, with the anterior orifice 
free. Branchiae (or arms .^) in the form of a double fan-shaped 
tuft of pinnated filaments, usually with coloured bands. At the 
base of each tuft there is a fleshy filament, one of which, being 
produced and terminating in an enlarged head, serves as a lid 
to the shell when the animal has retired. 
A. Shell irregular. Lid simple. 
Genus VERMILIA. — Shell attached throughout its whole length, 
the aperture rounded, with a toothed margin, and testaceous 
lid. 
I. — ^Recent Species. 
a. Lid double. 
Species 1. V. intricata . — Shell round, flexuose, and tapering to a fine point. 
Serpula intricata, Idnn, Syst. 736. — Penn. Brit. ZooL iv. p. 146. tab. xci. 
fig. 158 — Serpula vermicularis, Zoologia Danica, tab. IxxxvL fig. 9 — Mont. 
Test. Brit. p. 509. Adheres to stones, old shells and corals, and is common. 
This species is remarkably distinguished from its congeners, by its double 
infundibuliform lid, which, according to Montagu, bears a close resem- 
blance to his Serpula reversa, the Heterodisca reversaof this article. It 
is probable that a more minute examination of the animals inhabiting 
shells of this form may lead to the establishment of several new species. 
b. Lid Single. 
2. V. vermicularis Shell transversely wrinkled, subcarinated. Lid con- 
cave, with a crenated margin. Tubus vermicularis, Ellis, Cor. tab. xxxviii. 
fig. 2 — Serpula triquetra. Bast. Op. Sub. vol. i. p. 79. tab. ix. fig. 3 — .Mont. 
Test. Brit. p. 511. On stones, common. 
According to Ellis, the right filament is subclavate and pointed. The 
branchiae are ciliated only on the upper side. In the “ Remarkable 
Ruins” of North Britain, by the late Rev. Charles Cordiner, Banff, 
there is one of the plates of objects in Natural History, No. V. inscribed 
Scolopendra, containing a figure of this species, in which the tentacula 
are improperly represented as ciliated on both sides. It is to be regret- 
ted that this author, in his figures of animals, studied effect as a painter, 
more than accuracy as a naturalist. Many of his representations of rare 
British species, I have, however, been able to identify with the products 
of the Zetland seas. 
3. V. triquetra.— triangular, dorsal ridge distinct. Lid concave, with 
a produced central forked process. Serpula triquetra, Sower. Brit. Mis. vol. i. 
p. 83. tab. xxxi. On an oyster 'shell. 
According to the figure referred to, the branchise are ciliated on both sides. 
It is probable that Montagu, in the Supplement to his Testacea Britan- 
nica, p. 157. No. 4. refers to this species in his account of the different 
