The bones were mostly of a paper or card-like thinness, and were originally hollow like the thin bones of birds. In the jaws of other animals, and in the sea, they were easily fractured, so that proximal ends and distal ends and shafts and split bones abound, while perfect bones are almost unknown. Even those bones like the carpals, which almost retain their entirety, invariably show indications of having been rolled on the sea-shore among the nodules of phosphate of lime with which they now occur, in their angular margins being rounded, and in the removal of slender processes. The rock in which these fossils are found is a thin bed of chalky marl which is heavily charged with dark-green grains of Glauconite, and is quarried largely, and entirely dug away to be deprived of the dark-brown nodules of phosphate of lime with which it is stored. In digging and in the subsequent washing, the workmen, stimulated by an ample reward, pick out the fossils as they are discovered. They are separated easily from the matrix of investing marl, so that every aspect of each bone is seen, except for the occasionally adherent oysters and the masses of phosphate of lime, with which material the bones are also filled. Hence these remains afford facilities for the study of the _joints_ such as no other specimens have presented; and from their large size and comparatively great numbers, render easy the labour of the student who seeks to contrast them with the bones of other animals. The osteological collection has been formed without regard to species or genera, and arranged to exhibit the structure and organization of the tribe of animals. So far as possible each bone, as humerus, femur, &c., has its variations of structures and form contrasted on a single tablet. The series comprises the following bones: Fore-part of sternum. Coracoid (perfect). Scapula (nearly perfect). Humerus (perfect). ?Radius (proximal end). Radius (distal end). ?Ulna (proximal end). Ulna (distal end). Proximal carpal. Distal carpal. Lateral carpal. Wing-metacarpal (proximal and distal ends). First phalange (proximal and distal ends). Second phalange (proximal end). Metacarpal or metatarsal (distal end). Claw phalange. Os innominatum (parts of ilium, ischium, and pubis). Femur (perfect). ?Tibia (proximal end). Atlas and axis. Cervical vertebræ. Dorsal vertebræ. Sacrum and sacral vertebræ. Caudal vertebræ. Lower jaw (dentary and articular ends). Premaxillary bones, &c. Teeth. Quadrate bone (distal end with quadrato-jugal). Ethmoid with basi-sphenoid. Occipital and parietal segments of skulls. Basi-occipital and basi-temporal. Cast of brain-cavity. They are exhibited in Compartments _a_, _b_, _c_ of the Table-case of Cabinet =J=. The letter =F= in a circle is placed against figured specimens. History.