36 
AYES. 
caudal varies most. The individuals of a species are said to agree in 
their myological arrangements, so far as the above are concerned. 
Genera likewise coincide, unless where the alliance is false. In families, 
there is apparently less precision ; and as to orders, doubt yet reigns. 
Using the ambiens muscle as a key, the typically kneed birds (typical, 
because the ambiens runs in the tendon of the knee) are termed llorna- 
logonatoi, and all others Anomalogonatce. The accompanying tabular 
view conveys the author’s idea of the serial disposition of the Class A ves. 
In those divisions with an asterisk (*) appended, none of the genera have 
an ambiens muscle ; with a dagger (f ), that muscle is wanting in certain 
genera only. 
Sub-Class Homalogonat^. 
Ord. I. Galufoumes. 
Cohort a. Struthiones. Fam. 1, Struthiouidae; (sub-fam. Struthioniuao, 
Rheinae). 2, Casuariidae*. 3, Apterygidae. 4, Tinamidae. 
j8. Gallinaceas. Fam. 1, Palamedeidae. 2, Gallinae. 3, Rallidae. 
4, Otididas ; (sub-fam. Otidinae, Phoenicopterinae). 5, Muso- 
phagidae. 6, Cuculidae; (sub-fam. Centropodinae, Cucu- 
linae). 
7. Psittacif. 
Ord. II. Anseriformes. 
а. Ausoros. Pam. 1, Anatidu). 2, Sphoniscidae. 3, Colymbidas. 
4, Podicipidae*. 
/3. Nasutae. Fam. 1, Procellariidaef. 2, Fulmaridae ; (sub-fam. 
Fulmarinae, Bulweriinae). 
Ord. III. OlCONIIFORMES. 
o. Pelargii. 
Cathartidas. 
7. Herodiones*. 
8. Steganopodes. Fam. 1, Phaethontidae. 2, Pelecanidae. 3, 
Phalaqrocoracidae. 4, Pregatidae. 
б. Accipitres. Fam. 1, Falconidce. 2, Strigidas*. 
Ord. IV. Charadriiformes. 
o. Columbaef . Fam. 1, Columbid^. 2, Pteroclidae. 
/3. Limicolae. Fam. 1, Charadriidae. 2, Gruidae. 3, Laridae. 4, 
Alcidas. 
Sub-Class Anomalogonatae. 
Ord. I. PiCIFORMES. 
Fam. 1, Picariae (sub-fam. Picidae, Ramphastidae, Capitonidae). 
2, Upupidae. 3, Bucerotidas. 4, Alcedinidae. 
Ord. II. Passeriformes. 
Fam. 1, Passeres. 2, Bucconidas ?. 3, Trogonidae. 4, Meropidae. 
6, Galbulidae. 6, Caprimulgidae. 7, Steatornithidac. 8, Cora- 
ciidt© ; (sub-fam. Coraciinoa, Momotinae, Todinae ?). 
Ord. III. CVPSEI.I FORMES. 
Fam. Macrochires : (sub-fam. Cypselinae, Trochilinae). 
