CONCHIFERA. 
235 
of the tube entirely closed by a trapezoidal plate, which fills 
up the space left by the sinus in the two valves. 
The posterior portion of the tube is of a different consis¬ 
tence from the anterior part, having a horny texture and ap¬ 
pearance ; the interior of the valves is thickly lined with the 
same testaceous matter as the tubes. The testaceous substance 
is generally so much thickened in front, that it almost entire¬ 
ly conceals the tooth-like processes. 
1. Teredina personata. —The Masque Teredina, pi. 
XCVI. figs. 14, 15, 24, 26, 27, 28. 
T. personata. Sowerby, I. p. 232, pi. 102, figs. 1 to 4. 
Valves transversely striated on the posterior side; anterior 
side smooth, with a few lines of growth ; the accessory plate 
pentangular and smooth; tube as thick as the valves. 
In the London Clay, Sheppy and Epernay. 
Genus LXXII.—TEREDO.— Linnaeus . 
Shell equivalve, inequilateral, and orbicular, with a subulato 
process in front, and gaping at both sides; anterior opening 
angular at the back, and the posterior one rounded in front; 
an elongated, curved, tooth-like process emanates from the in¬ 
side, in both valves, protruding from the beaks ; anterior mus¬ 
cular impression situate upon the subulato process ; shell 
placed on the anterior extremity of a testaceous accessory tube, 
which is secreted by the animal in its progress through wood, 
&c., and forms a lining to the perforated cavity, becoming 
gradually wider as the animal advances, and is frequently fur¬ 
nished internally with a vaulted septa; aperture of the tube 
round, and posteriorly divided into a double tube, which the 
animal has the power of closing by means of two palmate, 
sometimes pennated apercula. 
1. Teredo navalis. —The Ship Teredo, pi. XCVI. fig. 13. 
T. navalis. Brown, Ill. Rec. Conch. Bri\ p. 116, pi. 50, 
figs. 1 to 7. 
Valves triangular, ear-shaped behind, and hemispherical 
when closed, with a curved tooth on the margin of the umbo- 
nal region ; surface of the valves striated in various directions, 
each with a triangular projection in front, inclining inwards 
and conforming to the angular form of the valves, with a 
lengthened flat curved tooth, projecting inwards under tho 
beaks ; tube flexous, and without any regular form. 
The Coral Crag, Sutton. 
2. Teredo ampiiisilena. —Tho Blind-Worm Teredo, pi. 
XCVI. figs. 16-19. 
T. amphishama . Sowerby, VII. p. 17, pi- 618. 
Valves unknown; tube much lengthened, tapering, tortu¬ 
ous, strong, and smooth, composed of short segments with 
sharp edges, and concave imbricated surfaces. 
The London Clay, Marham and Gay ton. 
3. Teredo ANTENAUTyE. —PI. XCVI. figs. 31-33. 
T. antenautoe. Sowerby, I. p. 231, pi. 102. 
Valves transversely striated, those on the anterior side 
numerous, zig-zag, minutely toothed, smooth, with dorsal 
posterior accessory valves testaceous. 
Tho London Clay, Sheppy and Nuneham. 
Genus LXXIII.—FISTULANA.— Bruguiire. 
Shell equivalve, inequilateral, transversely elongated, and 
gaping widely at the basal margin ; anterior side very short; 
valves attached by a ligament, and situate in the lower part of 
a testaceous tube, which is closed at the lower or anterior ex¬ 
tremity, and to which they are confined by tho septum, and 
open at tho centre ; the posterior end attenuated and open. 
1. Fistulana ampullaria. —Tho Ample Fistulana, pi. 
XCVI. figs. 9-12. 
F. ampullaria. Deshayes, Coq. Fos. pi. I. figs. 17-21. 
Sheath sandy, bottle-shaped, and continuous; aperture in¬ 
ternally bicarinated; shell ovate, gaping widely, the hiatus 
oval, with sinuosities. 
The London Clay, Barton. 
Genus LXXIV.—CLAVAGELLA.— Lamarck. 
Shell consisting of a testaceous tube, somewhat attenuated, 
and open at its anterior extremity, irregularly ovate, sub-cem- 
pressed, claviform, and closed at its lower end, excepting by 
a number of irregularly formed minute tubes; clavate termin¬ 
ation provided with an irregular, thin, flattened, pearly adhe¬ 
rent valve, on one side, with a loose, extremely thin valve at 
tho bottom of tho tube, which is supposed to bo united to the 
fixed valve by a ligament in a living state; an irregular mus¬ 
cular impression near one side. 
The tube of the Clavagellm is sometimes free, and, at others, 
it lines sub-marine bodies, such as madrepores, stones, and 
clay. 
1. Clavagella coronata. —The Crowned Clavagella, pi. 
XCVI. figs. 35-37. 
C. coronata. Deshayes, Coq. Foss. I. p. 8, pi. 5, figs. 15, 
16. Sowerby, V. p. 128, pi. 480. 
Tube straight, elongated, club-shaped, and crowned with 
about eight antler-like branched tubes, arranged in sets; the 
included valves oblong, sulcated, with strong lines of growth, 
and gaping widely; beaks acute and large; inside of both 
valves pearlacoous; tho sulcus which divides the two sets of 
tubes, with a branch that descends the side of the sheath in 
which the free valve is contained. 
The London Clay, Hampshire. 
