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CLASS THIRD. 
C I R R I P E D A; OR, BARNACLES. 
The animals are soft, destitute of a head, and consequently 
eyes; covered with a shell, and aro incapable of locomotion, 
being always affixed to extraneous bodies. The whole of the 
Cirripedcs are multivalve—that is, consisting of more than 
two pieces or valves. 
ORDER I.—PEDUNCULATA. 
Body supported on a tubular, membranaceous, moveable 
peduncle, the base of which is affixed to stones and other 
marine bodies, or timber floating in the ocean. 
Genus I.—POLLICIPES.— Leach. 
Body covered by a shell, and supported by a tubular, ten¬ 
dinous, squamiferous peduncle, which seldom exceeds two 
inches in length; shell multi valve, compressed on the sides, 
with the valves nearly contiguous and unequal; valves thir¬ 
teen or more in number, those on the sides smallest ; five 
uppor valves much larger than the others, the anterior pair 
conical, elongated, with their sides reflected backwards, situate 
on each side of the opening; the central or terminal pair 
largest, and trapezifonn, with an acute angle at the posterior 
extremity; dorsal valve greatly elongated, broad at the base, 
rounded on the back, with on acute apex ; between these, in 
the peduncle, aro a number of smaller, testacoous, generally 
triangular studs,— Pollicipes Cornucopia, pi. XCVTI. fig. 12. 
1 . Pollicipes rigidus. —The Rigid Pollicipes, pi. XCVII. 
figs. 7, 8, 9. 
P. rigidus. Soworby, Geo. Tr. 2d Scr. IV. p. 335, pi. 11, 
fig. 6* 
Posterior valves furnished with thin, transverse, very pro¬ 
minent elevations ; lateral valves somewhat elongatod. 
The Gault, Foikstone. 
2 . Pollicipes l^evis. —The Smooth Pollicipes, pi. XCVII. 
figs. 19 to 24. 
P. Iwris. Sowerby, Geo. Tr. 2d Ser. IV. p. 335, pi. 11, f. 5. 
Lateral valves rhomboidal, smooth, thin, and almost flat. 
The Gault, Foikstone, and the Greensand, Blackdown. 
3. Pollicipes unguis. —The Claw Pollicipes, pi. XCVII. 
figs. 4, 5, 6. 
P. unguis. Sowerby, Geo. Tr. 2d Ser. IV. p. 335,pi. 11, f. 6*. 
Valves all remarkably curved, broad in proportion to their 
length, and smooth. 
The Gault, Foikstone. 
4. Pollicipes radiatus. —The Radiated Pollicipes, pi. 
XCVII. figs. 10,11. 
P. radiatus. Sowerby, Goo. Tr. 2d Ser. IV. p. 335, pi. 11, f. 6, 
Valves wedge-shaped, flat, with sharp, elevated rays diverg¬ 
ing from their apices. 
The Lower Greensand, near Lympne, Kent. 
5. Pollicipes antkiuus. —The Ancient Pollicipes, pi. 
XCVII. fig. 5. 
P. (?) Sowerby, Geo. Tr. 2d Ser. V. p. 136, pi. VIII. 
figs. 34*36. 
Posterior valves long, curved, narrow, and striated trans¬ 
versely ; lateral valve obliquely sub-quadrate; stria) triangu¬ 
lar. 
The London Clay, llighgate. 
6. Pollicipes minutus. —The Minute Pollicipes, pi. 
XCVII. figs. 36 to 45. 
P. (?) Sowerby, Geo. Trans. 2d Ser. V. p. 136, pi. 9, f. 2. 
Posterior valves elongated and straight; lateral valves 
triangular, with waved stria). 
The London Clay, Hampstead. 
7. Pollicipes maximus. —The Largo Pollicipes, pi. 
XCVII. figs. 17, 18. 
P. maximus. Sowerby, VI. p. 222, pi. 606, figs. 3-6. 
Terminal valves plain and rhomboidal, sometimes with a 
central ridge and lines of growth ; posterior valve lanceolate, 
much elongatod, and arcuated; posterior valve, figs. 13 and 
18, terminal; valve 17, anterior valve. 
In the Chalk, Northfloet and Norwich. 
8. Pollicipes reflexus. —The Reflected Pollicipes, pi. 
XCVII. figs. 25 to 33. 
P. redexus. Sowerby, VI. p. 222, pi. 006, fig. 8. 
Posterior valve lanceolate, straight, or recurved ; lateral 
valves almost flat and smooth. 
Upper Marine Formation, Colwell Bay, Isle of Wight. 
9. Pollicipes sulcatcs. —The Furrowed Pollicipes, pi. 
XCVII. fig. 12, 13. 
P. sulcatus. Sowerby, VI. p. 221, pi. 606, figs. 1, 2, and 7. 
Valves with longitudinal, elevated stria); the terminal 
valve, fig. 2, elongated and rhomboidal; posterior valves, 1 
and 3, aro acuminatod, broad, lanceolate, and somewhat car- 
iuated; both aro furnished with irregular, sharp, elevated, 
longitudinal striae. 
In the Chalk, Lewis and Norwich. 
ORDER II.—SESSILIA. 
Destitute of a peduncle; body enclosed in a multivalve 
shell, attached by its baso to marine bodies; mouth situated 
at the upper and interior portion of the body. 
