. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. BLOOD SYSTEM. 36 culum or gill cover. Lift this and look in; we see se^ eral rows of red gill fringes, between which there ai openings into the throat—gill slits. Look next into th throat; we see several cartilaginous arches, gill arche with gill slits between. On these arches are fixed th gill fringes, extending backward and outward undc. Fig. 250.—Head of a fish with parts cut away so as to show the brain, spin cord, and the gills : cb, cerebellum ; op, optic lobes ; cr, cerebru
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. BLOOD SYSTEM. 36 culum or gill cover. Lift this and look in; we see se^ eral rows of red gill fringes, between which there ai openings into the throat—gill slits. Look next into th throat; we see several cartilaginous arches, gill arche with gill slits between. On these arches are fixed th gill fringes, extending backward and outward undc. Fig. 250.—Head of a fish with parts cut away so as to show the brain, spin cord, and the gills : cb, cerebellum ; op, optic lobes ; cr, cerebrum ; olj olfactory lobes; ol/org, olfactory organ. The opercle is removed ar the gill fringes partly removed, so as to show the four gill arches. the opercle. The fringes are thin, flat plates fixed t the gill arches, like the teeth of a fine comb to its sten They are very thin, very numerous, and arranged in tw rows (Fig. 251). The purpose is to make as much sui face as possible. They are intensely red, because th blood is profusely distributed in them. The blood passe along each arch, and is thence distributed on the fringe: Mechanics of Breathing.—The mouth is opene and the throat enlarged and filled with water. By shui ting the mouth and contracting the throat the water i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomycomparative
