Forbes drew attention to a certain community amongst birds and other vertebrates, invertebrates, and amongst plants, on all the lands stretching towards the south pole.
The scope of the anatomical part of the following article is a general account of the structure of birds (A y es) in so far as they, as a class, differ from other vertebrates, notably reptiles and mammals, whilst features especially characteristic, peculiar or unique, have been dwelt upon at greater length so far as space permitted.
Slonaker, " Comp. Study of the Area of Acute Vision in Vertebrates," Journ.
Goodrich that the vascular system and the coelom are in communication (as in vertebrates by means of the lymph system).