. The birds of eastern North America : with original descriptions of all the species which occur east of the Mississippi River, between the Arctic circle and the Gulf of Mexico, with full notes upon their habits, etc. , . ranes of Corys Gannet, compared with that of the Com-mon Gannet, the Liryngeal vibrating membranes being the same, and counting out the mere rudiment of thesemiluna seen in tlie Common Gannet, as this is without doubt functionless, should give to this species agreater power of voice. In fact, such is the case, and I have heard Corys Gannet give more notes than Iever heard the
. The birds of eastern North America : with original descriptions of all the species which occur east of the Mississippi River, between the Arctic circle and the Gulf of Mexico, with full notes upon their habits, etc. , . ranes of Corys Gannet, compared with that of the Com-mon Gannet, the Liryngeal vibrating membranes being the same, and counting out the mere rudiment of thesemiluna seen in tlie Common Gannet, as this is without doubt functionless, should give to this species agreater power of voice. In fact, such is the case, and I have heard Corys Gannet give more notes than Iever heard the Common Gannet utter, but the cries of both are very harsh and discordant. In Corys Gannet, as remarked, there is no indication whatever, of the singular gland which I havecalled the thymus, adhering to the larynx, but there is a rudimentary thyroid present attached to the sin-gle carotid arterj. This is a small elliptical body, about . long and lies on the inside of the carotid, theleft of which only is developed; see Fig. 18, a being the carotid artery, c, the thyroid gland, h, the heart, n,w, X, and z, other arteries. The thyroid is quite likely functionless, or nearly so ; 1 judge this to be a fact Fig.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
