Lamarck’s Genera of Shells. 73 
in a spatulate lingula. Operculum orbicular, galeiform, armed 
on the upper part with from five to nine testaceous valves 
attached to its margin on one side only, the middle one linear, 
truncate, and larger than the others. 
Type. Galeolaria cespitosa *. 
Shells angular; rather short, crowded together; lingula of 
the aperture, channelled. New Holland. 2 Species. 
5. Magilus. 
Animal unknown. 
Base of the shell twisted into a short, oval spiral, with four 
convex contiguous whorls, the last larger than the rest, and 
extended into an elongated, straight-wavy tube. Tube convex 
above, keeled below, rather depressed, and plaited at the 
sides ; the plaits lamellar, crowded, wavy, vertical, and thicker 
on one side of the tube than on the other. 
One species. Magilus antiquus t. (Isle of France?) 
CLASS X. 
CIRRIPEDA {¢. 
Animals soft, without head or eyes, testaceous, fixed. Body 
as if reversed, not articulated, having a mantle, with cirrous, 
many-jointed tentacular arms, on the upper part. Mouth 
rather inferior, not -projecting ; jaws transverse, toothed, dis- 
posed in pairs. Number of arms various, unequal, arranged 
in two rows, each composed of two setaceous, many-jointed, 
fringed cirri, covered with a horny integument, and supported 
on a common pedicle. A trumpet-shaped tube, terminated by 
the anus. 
Medulla, longitudinal, knotty ; branchie external, sometimes 
concealed ; circulation by a heart and vessels. 
Shell multivalve, sessile, or elevated on a flexible, tendinous 
pedicle; valves unequal, sometimes moveable, sometimes fixed, 
covered internally by the mantle. 
This class contains two orders : 
1, Sessile Cirripeda. , 
2. Pedunculated Cirripeda. 
* Matted, from cespes, a turf. + Ancient. 
¢ From cirrus, a curl, and pes, a foot, signifying curled feet. 
