sm OP OO 
9. 
220; 
Subs 
Pe 
mil 
. 14, 
. 15. 
. Side view of bronchial ring? of the same species. 
. Tracheal rings of Dinornis ingens (?): a, full view; 6, front view; c, back view. 
. Inside view of a tracheal ring of Dinornis elephantopus (?). 
. Broad variety of tracheal rings of Dinornis ingens (?). 
. Narrow variety of tracheal rings of Dinornis ingens (?). 
. Two partially united tracheal rings of Dinornis ingens (?). 
. Two partially united tracheal rings of Dinornis ingens (?), simulating a spiral. 
. Two partially united tracheal rings of Dinornis ingens (2), simulating a spiral. 
. Tracheal rings of Dinornis robustus (?): a, full view ; 6, back view ; ¢, front view. 
. Narrow variety of tracheal rings of Dinornis robustus (?). 
. Broad variety of tracheal rings of Dinornis robustus (?). 
. Two partially confluent rings of Dinornis robustus (?): a, smooth united part ; 
PROFESSOR OWEN ON THE GENUS DINORNIS. 
PLATE XLVII. 
. Tracheal rings of D. crassus: a, b, ¢, varieties, full view; d, oblique view, from 
near the head. 
. Side views of (a) large ring and (6) small ring, showing inequality of depth 
of hoop. 
. Full view of subcircular rings, D. erassus. 
. Group of seven tracheal rings, D. erassus. 
. Group of five tracheal rings, D. crassus. 
. Group of four tracheal rings, D. crassus: a, front view; 6, side view. 
. Groups of two rings, showing appearance of alternate breadth and narrowness 
of parts of hoop: a, front view; 4, back view; ¢, side view. 
. Part of ossified “ thyroid cartilage” of upper larynx of Dinornis crassus: a, outer 
surface; 6, inner surface. 
D. crassus: a, part of the chief bone of the lower larynx; 6, c, upper bronchial 
ring. 
Tracheal rings of Dinornis rheides: a, b,c, varieties, in full view; d, oblique view. 
Broad variety of tracheal rings, edge views: a, broader side; 6, narrower side. 
Group of four tracheal rings, D. rheides. 
Tracheal ring of Dinornis elephantopus (?): a, full view; 6, side view. 
Broader variety of tracheal ring of the same species. 
Narrow variety of tracheal rings of the same species: a, full view; 6, side view. 
<, rough anchylosed part. 
. Two confluent rings of the broad variety of Dinornis robustus (?). 
. Two partially confluent rings of Dinornis robustus (?). 
. Inside view of two confluent rings of Dinornis robustus (?). 
. Longitudinal section, showing inner surface of two confluent rings of Dinornis 
ingens (?). 
. Longitudinal section of a tracheal ring of Dinornis robustus (?). 
