214 ON CERTAIN MUSCLES OF BIRDS. 
a primary division is the result which the following facts will in great 
measure justify. It may be stated at once, however, that there are * 
a few undoubtedly homalogonatous birds in which the ambiens muscle 
is absent; there cannot be any anomalogonatous birds in which it is 
present. 
The following table (Table I.) contains the names of the various 
most important divisions of the Class of Birds, arranged according as 
they are homalogonatous or anomalogonatous. Those homalogonatous 
divisions with an asterisk (*) against them do not possess the ambiens 
muscle in any of their genera; in those with a dagger (fT) it is want- 
ing in certain genera only. 
Taste I. 
Class AVES. 
Subclass HOMALOGONAT &. 
Order I. GALLIFORMES. 
Cohort (2) STRUTHIONES. 
Family 1. SrruTHIonip2. 
Subfamily 1. Struthionine. 
2 2. Rheine. 
Family 2. Casvarimpz (*). 
»  o& APTERYGIDA. 
» 4 TINAMIDz. 
Cohort (6) GALLINACES. 
Family 1. PALAMEDEIDa. 
» 2. GaLiina. 
»  o& RALLIDA. 
» Orrpz. 
Subfamily 1. Otidine. 
* 2. Pheenicopterine. 
Family 5. Musopwacipz. 
» 6. CucuLipa. 
Subfamily 1. Centropodine. 
a 2. Cuculine. 
Cohort (7) Psirtract (f). 
Order II. ANSERIFORMES. 
Cohort (2) ANSERES. 
Family 1. Anatipz. 
Page 117. » 2. SPHENISCIDA. 
» 93 COLYMBIDZ. 
» 4 Poprorprpm (*). 
Cohort (8B) Nasuta. 
Family 1. PRroceLiariup” (fF). 
» 2. FULMARIDZ, 
