Lamarck’s Genera of Shells. 77 
Shell laterally compressed ; five valved ; the valves contigu- 
ous, unequal; two on each side, the fifth, longer and narrower, 
on the back; the lower side valves largest. 
Type. Anatifa levist. (Lepas anatifera. Linn.) 
Shell compressed, smooth, tube pedicle-shaped, long, trans- 
versely wrinkled.—European, and other seas. 5 Species. Pl. 
iii. Fig. 14. 
2. Pollicipest. 
Body covered with a shell, and supported by a tubular, ten- 
dinous pedicle. Many tentacula. Pedicle generally very short, 
frequently shagreened, scaly, rugose, and pretty stiff. 
Shell multivalve, laterally compressed ; valves almost conti- 
guous, unequal, thirteen or more; lower side valves smallest. 
Type.  Pollicipes cornucopiat. (Lepas pollicipes. Gmel.) 
Pedicle short, coriaceous, squamose ; shell composed of nu- 
merous smooth unequal valves. Coast of La Mancha, Medi- 
terranean, &c. Pl.iii. Fig. 15. 3 Species. 
3. Cineras. 
Body pedunculated, wholly covered with a membranous tu- 
nicle, tumid above, with an anterioz aperture below the summit. 
Numerous slender, articulated, fringed arms, projecting through 
the anterior aperture. 
Shell composed of five testaceous, oblong, separate valves, 
not wholly covering the body ; two on the sides of the aperture, 
the others dorsal. 1 Species. Cinerasvittata§. British Ocean. 
Pl. iii. Fig. 16. 
4, Otion. 
Body pedunculated, wholly covered by a membranous tu- 
nicle, tumid above. 
Two horn-shaped tubes, turned backwards, truncated, open 
at the extremity, and placed on the summit of the tunicle. A 
rather large lateral aperture, through which project numerous 
articulated fringed arms. 
* Smooth. + Pollex, a thumb, or an inch, and pes, a foot. 
} Horn of plenty. § Banded. 
