. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 415.—Auditory vesicle of a heteropod mollusk (Pterotrachea) (after Claus). V,auditory nerve; Of, otolith in fluid of vesicle; Wz, ciliated cells on inner wall ofvesicle; Hz, auditory cells; Cz, central cells. have only one ; and the lowest of this group have an ear notgreatly removed from the invertebrate type, as may be seen inthe lamprey, which has a saccule with auditory hairs and oto-liths, in communication with two semicircular canals. Mostof the amphibia are without a membra
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 415.—Auditory vesicle of a heteropod mollusk (Pterotrachea) (after Claus). V,auditory nerve; Of, otolith in fluid of vesicle; Wz, ciliated cells on inner wall ofvesicle; Hz, auditory cells; Cz, central cells. have only one ; and the lowest of this group have an ear notgreatly removed from the invertebrate type, as may be seen inthe lamprey, which has a saccule with auditory hairs and oto-liths, in communication with two semicircular canals. Mostof the amphibia are without a membrana tympani. The froghas (1) a membrana tympani communicating with the inner earby (2) a bony and cartilaginous lever (columella auris), and (3)an inner ear consisting of three semicircular canals, a sacculeand utricle containing many otoliths, and a small dilatation ofthe vestibule, which may indicate an undeveloped membranous labyrinth is contained in a periotic capsule,partly bony and partly cartilaginous, which is supplied with 570 COMPARATIVE Fig. 416.—Otoliths from various animals (after Eiidinger). 1, from goat; 2, herring;3, devil-fish; 4, mackerel; 5, flying-fish; 6, pike; 7, carp; 8, ray; 9, shark; 10,grouse.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
