_i_, the guard, or rostrum of the osselet. _k_, sulcus, or furrow, on the ventral aspect of this species of Belemnite. _l_, capsule, or periostricum. _m_, the dorsal line. _n_, transverse section, showing the fibrous radiated structure of the guard. In the annexed outline the several parts are represented in their natural relative positions. The capsule, or most external investment, (_e_) is seen only in section, being removed to expose the rostrum or guard (the fossil body generally known as the Belemnite). The upper three-fourths of the rostrum are also taken away, to show the phragmocone which it originally enveloped. The straight transverse lines denote the chambers of the phragmocone; the latter is seen extending downwards till it terminates in a point or apex; that part of the cavity in the guard is called the _alveolus_. The _siphuncle_, or tube which extends through the entire series of chambers, and is situated on the ventral margin, is indicated at _c, c_. The dorsal processes (_a, a_) are seen on their inner aspect at the upper part; the diverging lines (_m_) between them indicate the impressions of the soft parts, of which some traces remain. III. Fossil Remains of Birds.--_The Moa, or Dinornis of New Zealand._ The bones of birds are of extreme rarity in a fossil state. Throughout the immense series of the palæozoic and secondary formations--the accumulated sedimentary deposits of innumerable ages--no unquestionable indications of the existence of this class of highly organized beings have been brought to light.