. L'anatomie comparée des vertébrés. L'anatomie, les vertébrés ; comparatifs. 290 anatomie comparative correspondent à vrai glandes sebaceous développé en lien avec sèche-rudiments, les poils de disparaître mais les glandes restant. Ils voulaient dans certains mammifères (p. ex. Monotrèmes, Armadillo, Manis, Dauphin, Phoque, éléphant, chameau). Modification de certaines glandes de sueur- connu comme les glandes de Moll sont également présents dans les paupières de mammifères, d'ouverture sur le bord des paupières près des cils.1 L'organe auditif. Certaines relations de la organes des sens tégumentaire de poissons et amphibiens peuvent être trac

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. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 290 COMPARATIVE ANATOMY correspond to true sebaceous glands developed in connection with hair-rudiments, the hairs disappearing but the glands remaining. They are wanting in some Mammals (e.g. Monotremes, Armadillo, Manis, Dolphin, Seal, Elephant, Camel). Certain modified sweat- glands known as the glands of Moll are also present within the eyelids of Mammals, opening on the margins of the lids close to the eyelashes.1 AUDITORY ORGAN. Certain relations to the integumentary sense-organs of Fishes and Amphibians can be traced in the organs of taste (p. 254), and the same is true of the auditory organ, the function of which is con- cerned with equilibration as well as with hearing : in all three cases the sensory epithelium is derived directly from the ectoderm. The first trace of the auditory organ is seen as a thickening of the ectoderm (auditory plate) on either side of the primary hind-brain between the trigeminal nerve and vagus group, which becomes invaginated and separated off to form a vesicle (Fig. 211), the epithelium of which eventually undergoes differentiation into elongated cells of sensory epithelium pro- vided with hair-like processes, and sup- porting cells (Fig. 212), as in that of the integumentary sense-organs referred to above. The sensory cells are in rela- tion with nerve-fibres which arise from the auditory ganglion. A, eye; LB, primitive After the vesicle of either side has tagh^: wat of "he Become separated off from the ectoderm, head ; HG, olfactory pit ; it sinks deeper and deeper into the meso- dermic tissue of the skull, loses its original pynfoim or rounded shape, and becomes divided into a superior and an inferior par^ called respectively the utriculus and sacculus, at first connected with one another by a wide utriculo-saccular canal (Fig. 213). From the former the so-called semicircular canals become developed, while from the latter the tube-like ductus endol

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