That in which the left carotid artery alone exists, as found in all other birds examined by Nitzsch, and therefore as regards species and individuals much the most common - since into this category come the countless thousands of the passerine birds - a group which outnumbers all the rest put togeth
That in which there is but a single carotid artery, springing from both right and left trunk, but the branches soon coalescing, to take a midway course, and again dividing near the head.
That in which the right carotid artery alone is present, of which, according to our author's experience, the flamingo (Phoenicopterus) was the sole example.
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