The Zoologist — May, 1874. 3989 



Cohort 5. AccipiTEES. Fain. 3. Bucerotidse. 



Fain. 1. Falconidse. ,, 4. Alcedinidae. 



„ 2. Stngidee. ^^.^^^ j^ PASSERIFOBMES. 



^ J TTT Fain. 1. Passeres. 



Order TV. CHARADRIIFORMES. ^ ^ ., ,„, 



Cohort 1. CoLUMB^. » ^- Buccomdie (?). 



n T • „ 3- Trogonidse. 



„ 2. liIMICOLiE. ° 



Fa??i. 1. Charadriidee. " „' _ ,, V, 



„ 2. Gruid^. » f- S^^^l^'^-^f- 



3. Larid^. " ^- Capnmulgidse. 



4. Alcidse. 



7. Steatornithidas. 



8. Coraciidae. 

 Subclass ANOMALOGONATL ^"¥- 1- Coraciinse. 



Order I. PICIF0R3IES. " ^- Momotinse. 



Fam. 1. Picariae. » 3- Todiuge. 



Subf. 1. Picidae. Oj-i^r III. CYFSELIFORMES. 



„ 2. Ramphastidae. Fa??i. 1. Macrochires. 



„ 3. Capitouidae. Subf. 1. Cypselinse. 



Fam. 2. Upupidee. „ 3. Trochilinae. 



" The Homalogonatous birds must be divided upon a different basis, and 

 their mjological formulae here come into service. Before going further it is 

 necessary to show that the habits of the species are not the cause of their 

 myological peculiarities iu most cases, though probably in some they do 

 affect them. The heron and the swallow have the same formula, and yet 

 how different their habits ? the same may be said of the owls and the swifts ; 

 the kaleege and the flamingo. The auk and guillemot, however, are most 

 probably but distantly related to the ducks and penguins if the peculiarity 

 in the nasal bones has the importance that I assign to it ; nevertheless, the 

 muscles of their legs agree more with them, than with the other Schizorhiual 

 birds. By a glance at Table II. the manner iu which the Homalogonati may 

 be best subdivided according to the facts that I have been able to bring for- 

 ward, may be obtained. Commencing with the orders, the Galliformes include 

 all those birds related to the fowls ; and notwithstanding the high opinions to 

 the contrary, I cannot feel justified iu separating the struthious birds away 

 from this group. It is not difficult, after having seen the formula of the 

 Musophagidae and Cuculidse (Table I.), to recognise that these famihes have 

 nothing to do with the Anomalogonatous birds, although they are peculiar 

 in the former having no caeca, and the latter a nude oil-gland. The Psittaci 

 also cannot be placed anywhere else. 



" The Anseriformes aU agree, with the exception of the storm petrels, 

 ■which are also otherwise difficult to place, in wanting the accessory semi- 

 tendiuosus (Y),* and in having the great pectoral muscle very elongate. The 



* These letters refer to a table for which I have no room. — E. N. 

 SECOJ^D SERIES VOL. IX. 2 B 



