. On the anatomy of vertebrates [electronic resource] . ales from b to c, fig. 458. The inferior tubercles,c> c> give attachment to the upper vocal cords ; which they helpto stretch, while they expand the ventricles, and afford freer mo-tion to the lower vocal cords, d, d. In the Beaver the epiglottisis triangular, with a vertical raphe on its posterior surface, termi-nating in a sac bordered by the vocal ligaments. There is a blindsac at the base of the epiglottis in Coelogenys Paca: in both Ro-dents the vocal cords are short and little salient, and the ventri-cles are shallow: the voic
. On the anatomy of vertebrates [electronic resource] . ales from b to c, fig. 458. The inferior tubercles,c> c> give attachment to the upper vocal cords ; which they helpto stretch, while they expand the ventricles, and afford freer mo-tion to the lower vocal cords, d, d. In the Beaver the epiglottisis triangular, with a vertical raphe on its posterior surface, termi-nating in a sac bordered by the vocal ligaments. There is a blindsac at the base of the epiglottis in Coelogenys Paca: in both Ro-dents the vocal cords are short and little salient, and the ventri-cles are shallow: the voice is acute. In the Porcupines boththe vocal cords and ventricles are wanting: they are mute, saveat the rut, when the male emits a low grunt. The Insectivora agree with other Lyencephala in the low de-velopment of the vocal organ and power. In the Hedgehog,fig. 459, besides the thyroid, cricoid, c, arytenoid, d, and epiglottala, cartilages, there is a triangular cartilage, f, between the basesof the arytenoids and the cricoid, called interarticular in. Larynx of the Rabbit,laid open from be-hind, nat. size, cccxx. Larynx and upperpart of trachea,Rabbit, nat. size. 586 ANATOMY OF VERTEBRATES. 459
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