Beginners' zoology . Fig. 219.— Gill Openings ofEel. Food Tube. — The gullet is short and wide. The stomach iselongated (Fig. 220). There is a slight constriction, or narrow-ing, where it joins the intestine. Is the intestine straight, or doesit lie in few or in many loops? (Fig. 220.) The liver has a gallbladder and empties into the intestine through a bile duct. Is the FISHES 117 liver large or small? Simple orlobed? The spleen {mi, Fig. 220)lies in a loop of the intestine. The last part of the intestine isstraight and is called the rectum. Is it of the same size as theother portions of the
Beginners' zoology . Fig. 219.— Gill Openings ofEel. Food Tube. — The gullet is short and wide. The stomach iselongated (Fig. 220). There is a slight constriction, or narrow-ing, where it joins the intestine. Is the intestine straight, or doesit lie in few or in many loops? (Fig. 220.) The liver has a gallbladder and empties into the intestine through a bile duct. Is the FISHES 117 liver large or small? Simple orlobed? The spleen {mi, Fig. 220)lies in a loop of the intestine. The last part of the intestine isstraight and is called the rectum. Is it of the same size as theother portions of the intestine ? The fish does not possess a pan-creas, the most important digestive gland of higher vertebrates. ^;^,>.. Fig. 220. — Anatomy of Carp. (See also coloured figure 4.) bf, barbels on head (for feeling) ; //, ventricle of heart; as, aortic bulb for regulating flow togills; f^, venous sinus; ai?, dorsal aorta; >«», stomach; /, liver: ^iJ, gall cyst; w/, spleen;d, small intestine; j/id, large intestine; a, vent; s,s, swim bladder; ni,ni, kidney; hi,ureter; lib, bladder; ro, eggs (roe>; vihe, opening of ducts from kidney and ovary. Questions: Are the kidneys dorsal or ventral ? The swim bladder ? Why? Why is theswim bladder double ? Does blood enter gills above or below ? The ovary lies between the intestine and the air bladder. In it is shown enlarged and filled with egg masses called roe. Itopens by a pore behind the vent. The silver lining of the body cavityis called the peritoneum. Is the air bladder in the perch simple or partly divided? In thecarp? () Is it above or below the centre of the body? Why?The air bladder makes the body of the fish about as light as wate
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
