2 Transactions. — Zoology. 



4. Anomalopteryx, including the species didiformis and 



curta. 



5. Pachyornis, including the species gravis, ponderosus, and 



clephantopus. 



The retention of the genera Palaptcryx and Cela does not 

 appear to me to be warranted by the facts. 



Dinornis and Pachyornis have broad beaks ; Emeus, 

 Mesoptcryx, and Anomaly pteryx narrow, more or less pointed 

 beaks ; and as these differences are correlated with well-marked 

 and definable characters in the cranium, maxillo-jugal arch, 

 and mandible, they allow of the separation of the moas into 

 three sub-families : one containing the tall, slender, flat-skulled, 

 broad-beaked Dinornis ; , another the small or moderate-sized, 

 narrow-beaked Emeus, Mesoptcryx, and Anomalopteryx ; and 

 the third the squat, thick-limbed, broad-beaked Pachyornis. 



Expressed in a tabulated form the proposed classification is 

 as follows : — 



Fainilv — Dinornithhxe. 



Sub-family I. Gigantornitliince. 

 Genus 1. Dinornis, Owen. 



Species — ■ gigantcus, maximus, robustus, ingens,. 

 torosus, struthioides, &c. 

 Sub-family II. MesornithincB. 



Genus 2. Emeus, Eeichenbach. 



Species — crassus, an undetermined skull called 

 provisionally species a. 

 Genus 3. Mesoptcryx, Hutton. 



Species — casuarina (including didina), three un- 

 determined skulls called provisionally species a, 

 b, and c. 

 Genus 4. Anomalopteryx, Eeichenbach. 



Species — didiformis (including parva), ? carta (in- 

 cluding oweni). 

 Sub-family III. Pachy ornithines. 

 Genus 5. Pachyornis, Lydekker. 



Species — gravis, ponderosus, clephantopus, an un- 

 determined skull called provisionally species a. 



As to the mutual relations of the various forms, Mesoptcryx 

 appears to be the most generalized genus, and to show most 

 nearly the ancestral characters of the family. Emeus may be' 

 looked upon as a large and muscular development of the 

 Mesoptcryx stock. Anomalopteryx may be considered as having 

 arisen from a common ancestor with Mesoptcryx, but to have 

 undergone specialisation in certain directions, the straight beak 

 and immense temporal fovea being two very striking peculiari- 

 ties. Pachyornis is probably to be derived from the Meso- 

 ptcryx stock, but shows great specialisation in its broad beak 



