4 
Creusia. — Shell sessile, fixed, orbicular, convex-conical, quadrivalve: valves unequal, 
united together, sutures distinct. Operculum internal, quadrivalve. 
Plate I. Fig. 16. (a) C. verruca. Outside. (Lepas verruca. — Linn.) 
(Z>) Inside. 
Pyrgoma. — Shell sessile, univalve, rather globular, ventricose, convex above; apex per- 
forated: aperture small, elliptical. Operculum quadrivalve. 
Plate I. Fig. 17. (a) P. crenata. Outside. 
(i) Inside. 
ORDER II. —PEDUNCULATED CIRRHIPEDA. 
THE body is supported by a moveable, tubular pedicle, having the base fixed on marine 
substances. — This Order consists of Two Divisions, viz. 1. The shell composed of conti- 
guous pieces. 2. The shell composed of distant pieces. 
Division l . — Shell composed of Contiguous Pieces. — 2 Genera. 
Anatifera. — Shell compressed at the sides, composed of five valves, which are contigu- 
ous and unequal; the lower side valves the greatest. 
Plate I. Fig. 18. A. las vis. (Lepas anatifera.— Linn.) 
Pollicipes. — Shell compressed at the sides, multivalve, valves rather contiguous, une- 
qual; in number, thirteen or more: the lower side valves smallest. 
Plate I. Fig. 19. P. cornucopia. (Lepas pollicipes. — Linn.) 
Division 2. — Shell composed of Distant Pieces. — 2 Genera. 
Cineras. — Shell composed of five testaceous oblong valves, separate, not covering the 
whole of the body: two at the sides of the aperture; the others on the back. 
Plate II. Fig. 3. C. vittata. [Icon. — Wood’s Conch. Tab. XII. Fig. 2.] 
Otion. — Shell composed of two* testaceous small semi-lunate separate valves, adhering 
near the sides of the aperture. 
Plate II. Fig. 4. O. Cuvieri. (Lepas aurita. — Linn.) [Icon.— Wood’s Conch. Tab. XII. Fig. 4.] 
This Shell has sometimes five testaceous valves ; sometimes two testaceous, and three horny valves. 
Vide Sowerby’s Genera. 
