12 



Order XII. PTEROCLETES Pteroclidae. 



XIII. GALLING. 



i. Peristeeopodes a. Cracidee. 



I). Megapodiidee. 

 ii. Alectoeopobes a. Phasiauidae. 



b. Tetraonidse. 



XIV. OPISTHOCOMI Opistliocomid*. 



XV. HEMIPODII Hemipodiidfe. 



XVI. FULICARI^ a. Rallid*. 



b. Helioruitliidse. 

 XVII. ALECTORIDES «. Aramid^. 



b. Eurypygidse. 



c. Griiidse. 



d. Psophiidse. 



e. Cariamidae. 

 /. Otidfe. 



XVIII. LIMICOL^. a. CEdicnemidee. 



b. Parridae, 



c. CliaradriidEe. 



d. Chionididse. 



e. Thinocoridae. 

 /. Scolopacidfe. 



XIX. GAVI^ Larida;. 



XX. TUBINARES Procellariidfe. 



XXI. PYGOPODES a. Colymbidfe. 



b. Alcidse. 



XXII. IMPENNES Spheniscidfe. 



XXIII. CRYPTURI Tinamidaj. 



Subclass II. RATIT^. 

 Order XXIV. APTERYGES. 

 XXV. CASUARII. 

 XXVI. STRUTHIONES. 



In the article to wliicli we have made such frequent aUusion, Professor 

 Newton concludes his history of Ornithology with some critical remarks 

 on the Class Aves. He would divide the Class into three Subclasses : — 



1. SAURUR.ffi, Haeckel. Archceopteryx the only lino wn form. 



2. RATIT.ffi, Merrem. 



a. With teeth. 



«'. With biconcave vertebrae As yet unknovrn. 



b' . With saddle-shaped vertebrae Hesperornis. 



b. AVithout teeth Recent and existing forms. 



3. CARINATiE, Merrem. 



a. With teeth. 



a' . With biconcave vertebrae Ichthyomis. 



V . With saddle-shaped vertebrae As yet unknown. 



b. Without teeth Recent and existinj? forms. 



